It is really unfair for him to compare you with a previous lover....
Your hymen does not provide any tightness,so just forget about that. He might also be just too small for you.
Do kegel exercises, and lots of it. Use the google to search for it if you do not know what it is. Also keep your legs together during intercourse. That will make it tighter for him. Also try different positions. You on top, from behind while you kneel, from behind while you are laying flat.
Other things you can try is to get himm off using your hands, or mouth (hand job or oral sex). For couples with real issues, anal sex is also an option, but do not let yourself be pressured into it if you do not want to.
I do not know if you do, but you can put your legs around him, use your hands to rub and massage him, talk to him and tell him how good you think he is and how much you like being with him, and how he makes you feel. All of this will improve his experience of sex. Ask him to show you what he likes.
I hope that both of you will find sex improving your relationship, rather than hurting it.