Boyfriend is acting Different

So lately my boyfriend has been acting out of the blue. Me and him have been through so much this past year and a half. Over the year I had found out he has had sex with at least 3 other girls . I was so sad that I didn’t even say anything and just blocked him and couldn’t eat for 3 weeks . I then hit him up on Facebook and asked him if he missed me cus honestly I could not stop thinking about him no matter what I did. Then we started talking again for about 3 months taking it slow . Then he finally told me that he loved me in aug . But came to my surprise he was talking to a whole different bitch for 5 months while talking to me . Figuring this out tru instagram, I then had sex with the guy who took my virginity, it was meaningless sex . Then speaking to my now current boyfriend telling him about the situation had shocked him , he was acting way more respectful towards me . Then when I finally agreed to see him the next weekend, he cried to me . I have never had a guy cry to me before. He apologized about everything . Then he asked me to be his girlfriend and I said yes cus I felt bad for hurting him . I can never get over the fact that I fucked someone other than him . We had sex the next day and surprise, surprise , I ended up pregnant. When I told him he thought I was lying and was saying that it wasn’t his . But then he apologized and told me he wanted to get married and he will support me . I wasn’t ready for a child and deep down I knew he wasn’t either so i asked for some abortion money . He was heartbroken it was quick about giving me the money . Before I could of even scheduled the abortion, I had a miscarriage. I never told him I miscarried and let him believe I had the abortion. He is so mentally and emotionally fucked up because of this whole situation. But he was more sensitive, caring and respectful towards me . A week ago he told me that he knows the kid wasn’t his cus that why I wanted an abortion. Today he called me fat and stupid. I don’t know what to do , I really love him and everytime I tell him I think we just arnt ment to be, he tells me that I need to calm tf down and that I am over reacting and overthinking everything. I truly love him but idk what to do anymore.