Relationship

So me and my ex was together for almost 4 years. We had a son together that is now three years old. During our relationship he wasn’t helping me out financially he had friends over the house 24/7 and he was always smoking weed. He also wasn’t keeping a steady job so I was doing things on my own. I was stressed out at times and was beginning to be very unhappy. I decided to break up with him so he could get his **** together. Two months before we broke up I seen a text from a girl and him asking could he come over and get in the bed with him. After our breakup I moved out and got my own place he was begging for me back and wanted to move in too. I wanted him to learn what it felt to pay bills and start to change. During this time I was learning he was ******* around with hella girls. So I decided to go to a guy from my past. We was nothing serious at that time. My ex was mad thinking I had moved on and he was angry. So now he has decided to move on with the girl I caught him sending that message too. He says it’s my fault I’m the reason he moved on because I hurt him because of breaking up with him. I wanna be back with him to get our family back but he’s already in a relationship and it’s been about four months. Am I wrong? Let me know