UPDATE ! Should I leave my fiancé for my ex

Ok so after reading some comments I see I need to give some background information. My fiancé and I met back in 2015 and talked for 6 months before I found out he had a girlfriend and soon as I found out I cut him off ! And we didn’t have any communication for 9 months when he said he wanted another chance and had since felt bad about what happened and that he really felt God tell him I was the one so we talked and tried to get to know each other again and even started going to church. Fast forward we get date got engaged and made wedding plans but during the planning I noticed he allowed his mom to basically plan our wedding ! I got so frustrated that I canceled the wedding and said let’s just go away to get married well during that time I had two miscarriages in which he didn’t even mention to his parents because he was so hell bent on having a kid once he was married because that’s what his mom wanted smh and yes he already has a son. Newho we had two incidents where the trust was broken/questioned and I learned about it during this last pregnancy and not wanting to risk my baby because my pregnancy was high risk I didn’t really assess the issues as I should have. Furthermore he told me his mom was talking shit about me because they said I argue a lot with him not knowing all the trust issues we have because of him so it’s been very stressful the last years and now that I’ve had the baby I’m realizing how much shit I’ve accepted from him and his family and now I’m not sure if I want to marry him. The title was misleading because I’m not going to leave him for my ex and haven’t really talked to my ex since two days ago and even then the conversation wasn’t raunchy and I plan on not talking to him again