My Husband cheated on me while I was in the hospital.

I (26F) and my husband (27M) have known each other since I was 16. We were friends up until we started dating in 2020, a year later we had our daughter whom we found out this past year is terminally ill. This past weekend I needed to go to the hospital and left our daughter with him. Well drs told me I may have a tumor in my leg but to call my Primary Care Dr (they were a terrible hospital but the closest to me). While in the hospital I had called him and he told me his boss was calling hung up never called me back was distant when I got home. He went outside to vape I went to check on our daughter found her playing on his computer. His social media was open and I saw a message from a female I don’t know pop up saying he hung up on her. The timing of the call was while I was in the hospital and when he hung up on me to talk to his “boss”. There were no other messages. I got our daughter into bed and confronted him. He admitted to the whole thing including deleting messages and that this had been going on for some time but he SWEARS their messages and calls weren’t inappropriate. I don’t believe him but now I’m at a loss as to what to do, I’ve been crying heartbroken at night but when our daughters awake I fake happy. I’ve given this man 3 years been in and out of the hospital with our daughter while he works. His only excuse was he felt unloved but I’ve gone out of my way to make him feel special and loved no matter how tired or in pain I am so I’m at a loss as to what I could’ve done more of. My best friend passed away December of 2021 and I just wish she was here to make sense of this.