I don’t know what to do anymore

So me and my partner have been together for almost 7 years now and we have 2 kids together. We got together in 2017 and all was great until 2021 when I found out he cheated on me on my birthday. The worst part and the part that pissed me off more than anything was I just had my second and his first born. he was doing it while I was going through a high risk pregnancy and in a lot of pain and also doing it while I was having my c-section and during the hospital stay. Fast forward to today I’m still with him mainly because I have no where to go and because his parents are telling me I have to stay for the kids that I don’t want them going back and forth. I kept my mouth shut because of me having nowhere to go but I’m reaching a point where I don’t think I can keep the relationship any longer. I’m very unhappy…

I don’t know how to end this post so I’ll end it here. I’m just in a dark depression right now and had to get it off my chest.