Her mother told
    her that a fortune-teller said that her marriage will be miserable!
Question

                my mother recently went to a fortune
      teller (which she is definetly not supposed to because it's haraam) and she was telling me
      that the fortune teller said that i will have a bad life if i marry my soon-to-be husband
      and that we will not stay together for more than 2 years.... i know that only Allah knows
      the future but i've been really worried by what she said....and what can i do to
      potentially "reverse"this from happening.... really i'm so confused i don't know
      what to think.
Praise be to Allah.Firstly: may Allaah reward you for your belief that
    Allaah alone knows the unseen  this is what we hope for you and for every sincere
    Muslim woman  and this is one of the essentials of faith in Allaah Alone.
But we wonder how, after saying this, you can be afraid of one who
    knows nothing of the unseen?
You have to be assured and put your trust completely in Allaah, for
    nothing will happen to you except that which has been decreed by Allaah.
Secondly:
The ruling on fortune-telling, i.e., soothsaying, and claiming to know
    the unseen, is that these are actions which condemn a person to Hell and put him beyond
    the pale of Islam.
Thirdly:
Fortune-tellers cooperate with the jinn; they are liars who cooperate
    with the shayaateen (devils), who do not help them except after they have changed their
    religion, and whoever changes his religion [leaves Islam] is to be executed. The ruling
    concerning those who go to them and believe them is that they are guilty of kufr; if they
    do not believe them, their prayers will still not be accepted from them for forty days.
The evidence (daleel) for the former is the hadeeth of Abu Hurayrah,
    according to which the Prophet 
 (peace and blessings of Allaah be upon him) said:
    Whoever goes to a fortune-teller and believes what he says, has disbelieved in what
    was revealed to Muhammad. (Narrated by al-Tirmidhi, 135; Abu Dawood, 3904;
    Ibn Maajah, 639; Ahmad, 9252. The hadeeth was classed as saheeh by al-Haakim (1/49), and
    al-Dhahabi agreed with him. Al-Haafiz ibn Hajar said, it has two corroborating reports
    narrated by al-Bazzaar with good isnaads. See al-Fath, 10/217)
    The evidence (daleel) for the latter is the report from
    one of the wives of the Prophet 
 (peace and blessings of Allaah be upon him), who said:
    the Messenger of Allaah 
 (peace and blessings of Allaah be upon him) said: Whoever
    goes to a fortune-teller and asks him about anything, his prayers will not be accepted for
    forty days. (Narrated by Muslim, 2230).
    Fourthly:
How the fortune-teller gets his information was explained
    in the hadeeth narrated by Abu Hurayrah, in which the Prophet 
 (peace and blessings of
    Allaah be upon him) said: When Allaah decrees a matter in heaven, the angels beat
    their wings in submission to His words, making a sound like a chain striking a rock. When
    the fear is banished from their hearts, they say, What is it that your Lord has said? They
    say: The truth, and He is the Most High, the Most Great. Then the one who is listening out
    hears that, and those who are listening out are standing one above the other 
    Sufyaan [one of the narrators] demonstrated with his hand, holding it vertically with the
    fingers outspread.  So he hears what is said and passes it on to the one below
    him, and that one passes it to the one who is below him, and so on until it reaches the
    lips of the soothsayer or fortune-teller. Maybe the meteor will hit him before he can pass
    anything on, or maybe he will pass it on before he is hit. He tells a hundred lies
    alongside it, but it will be said, Did he not tell us that on such and such a day, such
    and such would happen? So they believe him because of the one thing which was heard from
    heaven. (narrated by al-Bukhaari, 4424).
    Fifthly:
When the Shaytaan listens out to hear what the angels say to one
    another about the decree of Allaah, this is part of the knowledge of the seen, it does not
    not mean that the shayaateen have knowledge of the unseen. Then they add a hundred lies to
    that word, such as when a fortune-teller says that So and so will give birth to a boy, and
    the people see that he was right about that so they believe in him, but he adds lies about
    the child, saying that he will get married in such and such a year and will die in such
    and such a year and other such details. So he gains a high stature in peoples hearts
    and they seek to get close to him by bringing him gifts and money, and he makes a
    profession out of these lies when the people believe in him, and so he makes a living by
    haraam means.
Sixthly:
Not every fortune-teller is a kaahin (soothsayer). He may be a
    geomancer or reader of coffee-cups, because the kaahin, unlike the others, is one
    who receives information from the jinn. The others are just liars, but the same ruling
    applies to them, because they claim to have knowledge of the unseen, although the kaahin
    who cooperates with the shayaateen is more of a kaafir because the kufr of
    fortune-telling is compounded by the kufr of his interacting with the shayaateen,
    who do not give him what he wants until after he directed some acts of worship towards
    them in a manner which takes him out of Islam.
Seventhly:
You have to advise your mother not to go anywhere near these liars,
    lest she falls into sin or her good deeds are wiped out. Do not give up the idea of
    marriage, because marriage brings many benefits. It is an important matter which is part
    of the fitrah (natural inclinations of man) and of the religion. Your life will not be
    miserable, in sha Allaah; be optimistic and hope for a good and happy life. We ask Allaah
    to join you with a husband who is knowledgeable and righteous.
If something bad happens, and you marry someone with whom you are
    miserable, this is because of the decree of Allaah (qadaa and qadar), not because of
    what the accursed fortune-teller said or because he knows the unseen. This may happen as a
    test or trial. In any case, going ahead with the marriage  in addition to its own
    great benefits  will be a way of snubbing these liars and fortune-tellers, and those
    who believe in them. May Allaah help us and you to do all that is good. May Allaah bless
    our Prophet Muhammad.