What’s wrong with me

I (25 F) have a weird history with my fiancé (26 M) we met in 2022 two months after I split from my 4 year relationship with someone I was weeks away from marrying. Everything went fast and I got pregnant 6 months in. We were happy, comfortable etc. but 2 months after baby came we split for over a year. It just wasn’t working and I didn’t feel anything for him anymore tbh.

Skip to a year ago (last October ish) I moved closer to my baby daddy (now fiancée) he was seeing someone else and I was devastated.. cried every night.. missed him so much and thought wow I missed out on the love of my life. Skip to now. We’ve been together almost a year now and tbh.. I feel nothing again. I have no clue why I was so upset. Maybe I was scared to be alone? We’re supposed to be married in a month and I almost just feel no love there. We are intimate maybe 3 times a month, we are like good friends almost. He’s great, makes me laugh, but sometimes he’s extremely negative about legit everything. I’m not sure if that’s what pushing me away.. or I never loved him in the first place? Idk how to think or what to do. I’m scared to break it off in case I’m devastated again later.. like wtf do I do. I often think about my ex when I know shouldn’t.

TLDR/ He’s a great dad, and I’d hate to break up our family with our 2 year old.. I am just so lost.