Relationship dilema.. long read.. thoughts?

So my sons father (who I’ve been with for 3 years) is currently incarcerated. He’s been gone for a year and will not be back home til next year, our relationship was so great, until I found out he cheated on me multiple times with his bm, then he gave me the whole Im sorry I’ll change I was mad at you etc.. before he left he was just acting different. We lived together, slept in the same bed, and it was just like we were roommates Literally pushed me away, no sex nothing since June. At the time I was in school and raising our son so I’m like whatever it’s cool.. so the day before he leaves he swears to me on his dads cancer he didn’t hook up with his bm again— and what do you know?— lie detector test determined THAT WAS A LIE!

So that just drove me nuts. Fast forward to now- I’m debating if me giving him one last chance is even worth it anymore, I know there’s always going to be drama and I hate it, i don’t trust him one bit and he’s like i will earn it back.. but on top of that i just feel neglected and I’m not even a needy person but it’s like damn. I was beating myself up over his fuckboy self 🤦🏻‍♀️ part of me has hope that what he sayin is true about him changing etc and part of me is like that’s prison talk.. who knows what he’s tellin his bm 🤷🏻‍♀️

The guy I dated 2 years before I met my sons father has always been in my life I’ve known him over 6 years and the reason we spilt was because we were in 2 differently mental levels, we both needed to grow up a little more. His daughter was born before him and I started dating and I was there the first year of her life ( we dated a year) but I’ve always been close to his family because before I even met him ( he was away at training) I was friends with his sister & cousin so I went to all the family events etc— well when I found out I was pregnant I told him because we were friends and he knew of the rocky relationship I had with my sons father at the time and he told me whatever he could help with he would etc cuz I was the same way with his daughter. Well we because distant after that, later I find out because he was upset. Flash forward to 2 years later (now) him and I hang out all the time, no sex or anythin involved, just as friends and we have play days with the kids, and his sister has kids the same age as mine so I always go to the family stuff.. well I am an overthinker and started thinking about a lot, well yesterday he told me that he still has feelings for me and it just makes it a lot more crazy.. I have feelings for him too, always have just wasn’t the right timing and still I feel like it isn’t the right timing.. but deep down my intuition is telling me my sons father is going to fuck everything up again and i worked so hard to try and be happy and I honestly don’t know what to do 😩