Venting and opinions

My ex bf and I ( we are two years apart with me being older but people think it’s the other way around because he’s taller ) had been together for a while and I noticed he started acting a little differently. We decided to take a break but we were still being a couple. Still doing things the way we did them before. Friday I found out he had dated a new girl but he had still been acting the same and telling me he wants to be with me and everything. Yesterday we found out

I’m not sure if it’s just me but what do y’all think. I showed him and he’s all i Love u I want to be with you I had sex with her because I was mad at you but her story is similar but different. Idk what to do at this point. We got in a bad fight and he had broke my finger and tried to break my car window. I punched him in the face and it’s like I do love this guy but maybe we are toxic for each other. Maybe we shouldn’t be bringing someone in the world when we are going through fights and infidelity. I love him and it’s like I lost my best friend. He was always here for me as I was for him Nd we always were around each other. Her story sounds a bit funny but so does his. I’m not picking sides and at this point I can’t even tell how i feel anymore. I can’t even cry. I feel broken but I feel fine. I don’t feel nothing but I want to laugh at it too. Idk I’ve kindly thanked him and told him how I felt without fighting and he was kind of crying but it’s like was the tears real or a show. Idk what to do. Anybody have some advice?