Feeling so alone in my pregnancy

My SO cheated and had sex with some nasty women and for the sake of being too nice I forgave him and wanted to try and work on things.. well also 3 months later I can’t get it off my mind and I’m just realizing that I just can’t move on, I’m unhappy. I feel so ugly and fat and I can’t even enjoy my pregnancy fully because he ruined the experience in a way. I feel like I’m not good enough or pretty enough and now that I’m 6 months pregnant almost I’m worthless and just unwanted by anyone. He ruined the way I look at myself, he took away my self love that I had for me. I just don’t know what to do, It’s very clear I’m going to need to end the relationship but I still can’t shake all these feelings that I’m literally nothing and I’m worthless because he cheated. I was begging him for sex while he turned me down to lay down in bed with another woman. I just don’t know what to do, how do I trust again? Where are the men that don’t cheat?! I just am so lost, it’s his birthday and my emotions are hitting extra hard today and I’m feeling extra awful about myself because of all of this... it’s his birthday so I’m just being cool and crying in the bathroom so he doesn’t see me and ask what’s wrong.,, tomorrow I plan to tell him the truth about how I feel and that I can’t get over what he’s done. I feel like the damage he has done will stick with me even if we break up. This is more of getting things off my chest than anything but any advice or words of wisdom would be helpful. I’m just so broken and I can’t even gather my emotions because I just feel everything 😔 I hope my son (it’s a boy) grows up to respect women and doesn’t pick up these awful habits from his father 😭😔