My boyfriend was sexually abused as a child

I really have this problem that I really cannot cope with. My boyfriend that I am are going to marry soon had a sad experience when he was 11. He used to go to his cousin’s house and she used to show him porn and try to seduce him. She was 32years old and that time and he was 11!! As an innocent my boyfriend fell to her lies and he had an intercourse with her. After 3 years in theis wrong relationship the his crazy cousin told him that she is pregnant.!!! He stayed with her for another 2 years and he left her because he began to realise that he was abused and fooled all the time by hes lies, she told him that se loved him. Now we ve been together for more than 3 years he s mature and grown up , his family does not know about this matter cause he is afraid that they will end up hating him. his child is now 4 years old and he looks much like him, I really cannot accept this fact , its really hard for me. Sorry I wrote for so long but I feel relly helpless abt this situation.I knew abt this from the 1st time I met him but still cannot accept it and I think that if we have a child as well we will be happy. He really would like to have my child. And also he does not have a relationship with his cousin nor his child anymore. He does not accept the fact that the child is his