What do I do?

Hannah

So long story short I had a baby. When my boyfriend and I found out I was pregnant he left me and slept with a girl named Lexie. He came back I was an idiot and let him back. Fast forward 12 months we have a beautiful little girl. we got in a fight I kicked him out for a week. I let him back and found out that he had been searching Lexie the girl he left me for in the first place and now I’m so hurt and angry and have no idea what to do. I called him out on it and he said he didn’t but like come on it’s in his google activity and in his recents. I pulled it up and he still had the nerve to deny it even thought I was right there in front of his face!!! Please what do I do?