Relationship vent

So..around this time last year, my bf and I started talking about marriage after 6 years only because I brought it up. I should have made sure from the beginning that we were on the same page. I don’t know why but I thought that people dated with intention of marriage. He said he wasn’t ready for it. So every few months I’d check in with him to make sure we were on the same page. We never were. I kept settling. This man wanted to buy a house with me but not marry me. Made a life long commitment with me by having a kid with me but doesn’t want to marry me. Talks frequently about having another kid..Anyways fast forward to now. He got into a bit of trouble and was in jail for a few days. I had his phone and had to bond him out. Well I was telling his friend by dm on Instagram what was going on. And in his dm he was speaking to a girl that he used to screw and they were reminiscing about it planning to meet up. This broke my heart but it’s not the first time he has done questionable things. I kept it to myself for two months and I finally decided to tell him about it. He played stupid at first and then said he was just bored . I asked if he does this all the time when he’s bored and would he be engaging in more inappropriate conversation. Do y’all know this fool told me he can’t speak for the future.

So lately I’ve been feeling like he’s only with me for our kid. She was unplanned. So I told him. And he admitted that he is unsure if he would be with me otherwise. I’m just so hurt. I think he’s also with me because of how financially stable I am. Sometimes he can’t cover rent so I do it plus our bills. I am ready to move on with my life. I am tired of hurting. He has already said he doesn’t really want me. And I dont want to stay together just for my daughter. She needs a happy mom. I feel like we can co parent together without problems. How should I tell him that I’m done?