Relationship break-up, dating, relationship, baby, breakup

Hello all,

I need some advice or just opinions whatever.

So January 2014 I was In a relationship w a guy named Sean, sean and I were cool things were moving along. I ended up realizing that I didn't like him as much as he liked me but I kept him around bc he was such a great person and I didn't want to have sex w someone else however we were not in a relationship any longer. . In the meantime, I met another guy named john in June of 2014. John and I hit it off immediately, but I realized that he was the player type. John and I started having sex at the end of July. Although I liked John the most I always knew he was still seeing other women and having sex w them as well. I still wanted him for some reason but I kept Sean around. Eventually I cut Sean all the way off in august of 2014 and focused solely on John. John and I were up and down a lot bc of his promiscuity he never wanted to be exclusive at this time but eventually he around January 2015. . Long story short John and I ended up having a baby in December of 2015. Just recently John and I had an argument about my past relationship from years ago which then made him google my ex Sean. John went out this past weekend and ended up seeing and approaching Sean. at a club. Sean told him that we last had Sex in September of 2014 and now John is done w me. I'm not sure what to do bc Sean is lying but John believes him since I was lying about Sean and I dating while John and I were dating and being intimate. Someone tell me if I have a chance again? Does John have a right to be upset, do you think he could ever move past it?