In need of advice

Me and my boyfriend/ baby father has been together almost 7 years now. Weve been on and off and back and forth for as long as I can remember. He cheats a lot but I care and love so much that I lve given him chances after chances. Times I have to feel like I have to be okay with him talking, or being sexually active with other females. When I was pregnant was the time I thought he would straighten up but he still cheated which hurted the most. After while we decided we would move together cause we was so tired of stayed where we were but it may have not been a good idea with everything that was going on. We needed time to talk and fix and trust but thats my fault ..but every since weve been here we argue and fight. Some days I cant get him to talk or to even look at me. Everyday he makes me feel like he dont want me around. One day I did something horrible and cheated and had someone else over and he came home and saw him and every since then he never lets it go our arguing got a whole lost worst and I just dont know what to do anymore. I never did anything with the other guy but he thonks. I did. I need advice. Everybody just saying just let it go but how do I do that after so long of being use to somebody and being around them everyday to not anymore. I cry so much the most Ive cried in my entire life.