AITI for talking and caring about my ex after what he put me through

I know this is probably going to be a pretty clear answer but I feel like seeing some other opinions may help me. So my ex (23m) and I (22f) broke up Monday after I found texts to his friend where he was basically sexting with her (without photos as far as I know). This isn’t the first time I had come across that in the 3 and 1/2 years we were together however this one hurt the most as it was just the most he had done this and it was with the one female I never thought I would have to worry about. I had caught him flirting or telling other women he had feelings for them around 5 times throughout our relationship and every time he convinced me that it was all my fault. Basically saying I didn’t give him enough love and so on. No matter what it was it was always my fault and I believed it. There were other problems within the relationship, like finding out he had a corn addiction pretty early on but I thought talking to him cleared that up. But there were still several times I caught him looking at that as well even after I begged him not to and told him that was really crossing my boundaries and was very disrespectful. I mean obviously looking at it now he didn’t respect me in any way but I always had the blame shifted on me. I broke it off with him Mon. so 3 days ago and I am still talking to him. I don’t plan on getting back together with him because I know nothing will change but I feel like an idiot for still caring but I can’t help myself. Am I the idiot for still giving him the time of day?