He
    discovered that his wife used to go out with someone before she got married
Question

                One of my friends just married with a
      beautiful girl a few months ago. Before marriage my friend was thinking that he's wife is
      so religious and never went out with any guy in her whole life. He was thinking that his
      wife has never done anything bad. He really loved her. But after a few months of marriage
      he found out that his wife has gone out with someone else and had boyfriend before
      marriage. My friend is really upset now.He really loved her wife and never thought of her
      like that. He doesn't love her anymore. He wanted wife like who never went out with anyone
      or had boyfriend. He doesn't understand what to do. He's planning to get divorce. When he
      asked me for my advice, i couldn't tell him anything because i have no idea what to say.
      So, please tell me what should i tell him. What should he do, next? Should he give divorce
      to her or forget about her past? What does islam says about this situation? Thank you,
Praise be to Allah.If this woman has mended her ways and has repented to
    Allaah and has given up haraam things and going out with men, and there are no reasons to
    be suspicious about her, then our advice is that your friend should keep her and conceal
    her past mistakes. Whoever conceals a Muslims faults, Allaah will conceal his faults
    in this world and the next. Allaah is Forgiving and Merciful, He forgives and accepts the
    repentance of the one who turns to Him in repentance. So we should be forgiving and should
    treat the one who has repented in accordance with the way he is now, and help him to
    continue to repent. The one who has repented is like one who has never sinned at all. If
    the husband conceals his wifes past mistakes and treats her well, this will be of
    immense benefit in helping this woman adhere to the straight path and encouraging her to
    continue living a life of purity and chastity; her husband will also have a great reward
    for concealing her faults, keeping her chaste and helping her to avoid evil and stay on
    the straight path, living under his care in a pure atmosphere in the marital home.
If this woman is still persisting in mischief and going out with men
    and committing haraam actions, and does not repent despite being advised to do so, then we
    do not suggest that he should keep her at all. Let him get rid of her and Allaah will
    provide him with another wife.
If she has repented, but he cannot bear what she has done in the past,
    and he is tormented with bad thoughts that give him sleepless nights, and he is scared
    that if he keeps her he may mistreat her even though she has repented, then he can divorce
    her so as to give himself peace of mind and avoid mistreating her. But he should look at
    the matter anew and think long and hard about the advice we have given here. Let him think
    about himself too: maybe he has made mistakes in the past, or will do so in the future. We
    ask Allaah to help him to make the right decision and to guide him to the best way. Allaah
    is the Source of strength and the Guide to the Straight Path.