My fiance cheated..and now he wants us both!

!! Attention!!: before you read this post on some nosy s*** understand I am not looking for sympathy for anyone to feel bad for me or to be belittled and kicks while I am down when I already learned my lesson i am looking for a SISTERHOOD. thank you have a beautiful day now you can read .

I've been with my fiance for 5 years now and he's cheated on me in the past, and it was always easy to get through you know... he never really said he cared about these people or anything like that we ended up losing our son in 2017. he was a stillbirth. a year later after that I ended up getting pregnant with our beautiful daughter. a month after having my daughter I was hit really hard with postpartum depression while I was dealing with postpartum depression... my fiance took it upon himself to go out and sleep with his coworker. we've been going through the motions of life you know you. don't have our own place at the moment so we were staying with relatives and the female that he has been cheating on me with has hit me up and asked if I was with him twice already... long story short I'll just say this my relative ended up kicking us out and I didn't have anywhere to go so me and my daughter had to go to my grandmother's house. my fiance said that he can stay with his friends house...just a couple days ago the female that he was cheating on me with hit me up. Asked me if I was still messing with him. me and her ended up banding together and calling him cuz he was at her house.. so me and her both confronted him while he was at her house. I have found out that he has been staying with her this entire time that we've been apart. he has told me that he loves her and he loves me and he isn't going to choose between the two of us. and I told him I didn't want to do that. and he told me that I would have to share him with her...so I told him that if I have to share him he has to share me. Fair in my eyes... and he doesn't want to do that. So what should do?

!!UPDATE!!.....ive already left him. Because im showing my daughter is shouldnt be tolerated