Her fiancé refuses to let her wear hijab
Question

                I am a religiously-committed Tunisian girl, but I have a problem. My fiancé refuses to let me wear hijab – even modern hijab. I am wondering whether I should go ahead with the marriage or reject him? Please note that most Tunisians are like this.
Praise be to Allah.Our advice to you is to 
    heed the command that Allaah has given to all people, the earlier and later 
    (generations), advice that combines the best of this world and the 
    Hereafter. Allaah, may He be exalted, says (interpretation of the meaning): 
“And verily, We have 
    recommended to the people of the Scripture before you, and to you (O 
    Muslims) that you (all) fear Allaah, and keep your duty to Him”
[al-Nisa’ 4:131]
What goodness can there be 
    in this world if it involves incurring the wrath of the Lord, may He be 
    exalted? What happiness can there be if it is not following that path that 
    leads to Allaah’s pleasure? Would a believer be happy to make gains in this 
    world and lose out in the Hereafter? 
Allaah says (interpretation 
    of the meaning): 
“O you who believe! Fear 
    Allaah and keep your duty to Him. And let every person look to what he has 
    sent forth for the morrow, and fear Allaah. Verily, Allaah is All‑Aware of 
    what you do. 
19. And be not like 
    those who forgot Allaah (i.e. became disobedient to Allaah), and He caused 
    them to forget their ownselves (let them to forget to do righteous deeds). 
    Those are the Faasiqoon (rebellious, disobedient to Allaah).
20. Not equal are the 
    dwellers of the Fire and the dwellers of the Paradise. It is the dwellers of 
    Paradise that will be successful”
[al-Hashr 59:18-20].
The Prophet  (peace and 
    blessings of Allaah be upon him) told men to choose a wife who is 
    religiously-committed, and he told women and their guardians to choose a man 
    who is also religiously-committed.  
It was narrated that Abu 
    Hurayrah (may Allaah be pleased with him) said: the Prophet  (peace and 
    blessings of Allaah be upon him) said: “If there comes to you one whose 
    religious commitment and attitude pleases you, then marry [your female 
    relative who is under your care] to him, for if you do not do that, there 
    will be tribulation on earth and much corruption.” Narrated by al-Tirmidhi 
    and classed as saheeh by al-Albaani in al-Silsilah al-Saheehah 
    (1022). 
The man who prevents his 
    wife from wearing hijab is not a man of good character or religiously 
    committed who deserves to be married. Rather it is most likely that the one 
    who prevents his wife from wearing hijab will also be negligent about other 
    major sins and actions that doom one to Hell. How can he protect his wife 
    and household, or how can he raise his children to obey Allaah when he is 
    disobeying Him and telling others to do likewise? 
It says in al-Mawsoo’ah 
    al-Fiqhiyyah (24/62): 
The wali (guardian) should 
    not give the female relative in his care in marriage to anyone but a man who 
    is pious and righteous. End quote. 
Shaykh Saalih al-Fawzaan 
    said in al-Muntaqa (4/question no. 198): 
When marrying, we should 
    choose righteous spouses who adhere firmly to their religion, who respect 
    the sanctity of marriage and the importance of good treatment (of spouses). 
    It is not permissible to be careless with regard to this matter. Such 
    heedlessness has become widespread nowadays, with regard to this important 
    matter. People give their daughters and female relatives in marriage to men 
    who do not fear Allaah and the Last Day, and they end up complaining about 
    the husbands and they are confused about how to deal with them. If they had 
    looked for a righteous man before marriage, Allaah would have made it easy 
    for them (to find such a man). But in most cases this stems from negligence 
    and a failure to seek righteous husbands, and a bad man can never be 
    suitable. It is not permissible to take this matter lightly, because (such a 
    man) will mistreat the woman and he may lead her away from her religion or 
    influence her children. End quote. 
Shaykh Ibn ‘Uthaymeen said 
    in Fataawa Noor ‘ala al-Darb (al-Nikaah/Ikhtiyaar al-Zawj/question 
    no. 16): 
What the woman’s guardian 
    must do if a suitor comes to propose to her is to find out about his 
    religious commitment and character. If they are good then he should give her 
    to him in marriage, and if they are not good then he should not do so, and 
    Allaah will bring to his female relatives one who is religiously committed 
    and of good character, for when Allaah knows that the reason why the 
    guardian did not give her to that suitor was so that a man of good character 
    and religious commitment could propose to her, then He will help him to find 
    such a man. End quote. 
What we think is that you 
    should not accept this fiancé, and Allaah will compensate you with someone 
    better than him. 
And Allaah knows best.