Please give advice

Me & my bf have been together for 3 years. We have a beautiful daughter together & he’s an amazing father.

When we first got together, the first 2 years were great. We were perfect. But the last year we’ve been together, it started changing and the last 6 months it really just went down hill.

Over the summer, I broke up with him and started seeing someone else and while that happened he went and had sex with 3 other girls. 2 of which are seriously my arch enemies. We ended up realizing we wanted each other and got back together. It kills me knowing he would have sex with my enemies but I gotta let that go because I’m the one who broke up with him. But it’s like ever since all that, we just haven’t been the same. Our sex life sucks, we fight over everything, we agree on NOTHING. But when we broke up over the summer he went to go live with his mom and I stayed at our place we had together and it broke our daughters heart (she was only 3 1/2). She was so confused and cried for her daddy all the time. So I don’t want that to happen again but something has got to give. Idk what to do. I love him and want a family with him and I know he wants that with me but at the same time I’m not happy. Things just aren’t the same. Plus we’ve been struggling financially for the first time ever in our relationship and my mom says that can really put a big strain on a relationship. I just need some encouragement. Or advice.