Need advice About sex problems

So my husband and i have been married for 3 months now. We did things a little backwards. We have a lovely 6 month old son Matthew. Anyways ever since my husband and i started dating he has always wanted a 3 way with another girl. He says he just wants to cross it off his bucket list. Anyways i told him i would never do it. Well a few nights ago i found out he was on dating apps. 9 to be exact. He never put he was married had a son. He just put looking for a friend. And he had message from a lot of attractive girls. I am 6 months postpartum and dont like my body. He also said a wile ago he wants to make the girl he want in the 3 way to be a virgin. ( when i was 17 i was raped so i was not a virgin when we started dating him.) it hurt so bad hearing that i cryed my self to sleep. Its not like i could have chosen to not lose my v card. I do love him so much but he keeps asking. He says all guys want to have a 3 way. I feel like shit he works 60-70 hours a week and i miss him so much but when he is home all he does is ask for a 3 way.

What do you ladys think?

He is 21 and i am 19 i know we are young.

I need to make sure i am not the only one that thinks he is being selfish and an ass. I dont trust anyone as it is.

Would love any opinions and advice. Just trying to make it work because of my son and i love him

I just found out i am 6 weeks pregnant also