Praise be to Allah.
If the young man who has proposed to you is pleasing in terms of religious commitment and character, then you should accept to marry him. You do not have to tell him about the matter of the hymen – if it is proven that it was broken – because there is no interest to be served by telling him, and because of the negative consequences that may result from telling him.
If he asks you after you get married, you can pretend that you did not know and you can use double entrendres. The hymen may be broken by many things, such as jumping, riding a bike, heavy menstruation, insertion of a finger, and so on. If you are forced to lie and you are afraid that if he finds out the truth he will divorce you, it is permissible to you to do that.
The scholars said concerning someone who fell into zina then repented, that she does not have to tell her husband and that it is permissible for her to lie in order to conceal herself. Undoubtedly one who was raped and did not approach sin by her own choice, or one to whom that happened before the age of accountability, is more deserving of being covered.
And Allah knows best.