He had a haraam relationship with a relative of his; is he obliged to marry her?
Question

                will i be responsible for the cries of a girl, with whom i had sexual relations, if i marry some other girl, because of being afraid that our families wont agree, as we are cousins and the girl is not very religious? or should i marry the same girl as we mqy remain attached even after marrying some other person? or should i marry the same person itself?
Praise be to Allah.
	Firstly: 

	Zina is a crime on its own, in terms of its sin and 
	consequences. None of its sin can be waived unless you repent sincerely to 
	Allah, may He be glorified and exalted, as He says (interpretation of the 
	meaning):

	“And those who invoke not any other ilaah (god) along with 
	Allah, nor kill such person as Allah has forbidden, except for just cause, 
	nor commit illegal sexual intercourse __ and whoever does this shall receive 
	the punishment.

	69. The torment will be doubled to him on the Day of 
	Resurrection, and he will abide therein in disgrace;

	70. Except those who repent and believe (in Islamic 
	Monotheism), and do righteous deeds; for those, Allah will change their sins 
	into good deeds, and Allah is Oft‑Forgiving, Most Merciful

	71. And whosoever repents and does righteous good deeds; then 
	verily, he repents towards Allah with true repentance”

	[al-Furqaan 25:68-70]. 

	Although marriage may offer concealment for what occurred 
	between you of immoral and indecent actions, it is not a prescribed remedy 
	for the sin and shame of zina. The remedy for that is sincere repentance and 
	mending one’s ways as much as possible in the future, and doing a lot of 
	good deeds, in the hope that Allah may bless you by accepting your 
	repentance and good deeds. 

	See also the answers to questions no. 
	147808 and 14381 

	Secondly: 

	In that case, we say to you: 

	If what you mean when you say that this girl is not religious 
	is that she is promiscuous and morally corrupt, and that she does not 
	respect the religion of Allah or protect herself (from shameful deeds) and 
	is not chaste, then forget about this girl and her ways; focus on yourself, 
	repent properly to your Lord, adhere to His commands, do as many good deeds 
	as you can, and keep yourself chaste by marrying a woman who is good and 
	righteous. 

	But if this girl has repented from what happened between you, 
	and it was the Shaytaan who tempted her to do that, as he tempted you, 
	because she was infatuated with you, or because of a mistake on her part, 
	and it seems to you from her attitude that she regrets having disobeyed her 
	Lord, and the worst that can be said is that she is careless with regard to 
	hijab, or with regard to some matters, then there is nothing wrong with you 
	marrying her, after you and she have repented. In fact we encourage you to 
	do that, because you and she have in common the crime of zina, and perhaps 
	it was you who tempted her or promised her marriage, or you led her on, 
	until you fell into that sin. In that case it is neither fair nor decent to 
	leave her to bear alone the shame and consequences of what you did together, 
	and let her carry that burden on her own, whilst you carry on with your life 
	as if you never did anything! 

	Undoubtedly your marrying her would come under the heading of 
	complete concealment that Allah loves for His slaves, and striving to 
	relieve the distress of one who is distressed, so long as he has repented 
	from his sin. 

	If you think that your family will object, then try to 
	convince them that marriage to relatives is not all bad, and make her show 
	them that which will endear her to your family. Encourage her to repent 
	sincerely and to show the effects of her repentance in her outward 
	appearance and her conduct. 

	If it is not possible for you to marry her, and your families 
	object to such a marriage, and you think that this marriage may be a cause 
	of severing ties of kinship or disobedience towards parents, then in that 
	case there is no blame on you if you end your relationship with her and 
	focus on your own affairs, and leave her to her own affairs, after making a 
	concerted and sincere effort to conceal her sin, keep her chaste and protect 
	her. And Allah will take care of her affairs, rectify her condition, enable 
	her to repent sincerely and bless her with a husband who will keep her 
	chaste. 

	And Allah knows best.