Is he being immature or he just doesn't care?

A few months ago my ex-boyfriend broke up with me and I still don't know the reason why. every time I ask he says "I did nothing" Now before the whole breakup he just stopped talking to me and his friends because he was dealing with some issues at home etc. but the funny thing is, he would still go out with his friends and when he finally messaged me, he broke up with me again for the second time. didn't talk some more after that, he even blocked me for and for what no one knows. Fast forward to now he keeps talking about other girls etc. knowing that I still have feelings for him and I never wanted the relationship to end. I don't know what's his deal honestly if he's trying to get a reaction out of me and he even told me one time that I'm his best friend :(….. yesterday I asked him what guy with sense would push away the only girl who genuinely care about him. and he said said "a guy who moved on" my thing is why ask me if you can come by me on Saturday and spend the day (he didn't come by the way because he said "he would come and we'd go talk and have a deep conversation that he does want to hear but at the same time he does and we'd ne all lovely dovey again. I don't know what to do honestly.

Is he being immature or he just doesn't care?
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