Just in need of advice- Help!!!

So let’s just have this ex that I just recently got out of a relationship about a month ago he claims as if he doesn’t care about the breakup and things like that which it effected me mentally because we literally been through everything together he been by my side through tough times and at the moment in my life I’m finding it hard to heal and move on because I still need answers like it’s times where I just wanna talk to him he claim he doesn’t care but still talk to me like what does that mean it times where things got heated between us and he blocked me but unblocked me two minutes later like what does that mean keep in mind I did everything for him bought him food and Lyfts and we broke up over something stupid which he ended up choosing his friends over me two females at that keep in mind he a senior nd they are freshmen’s me looking out for him today I was just like you don’t feel bad that you have freshman friends because you a senior yk one rumor from a freshman could ruin your whole reputation he talking about I don’t have one blah blah but me being a caring ex I don’t want bad to happen to him den I asked him a questions such as would you rather have a gf that’s willing to do things for you or have friends that can’t help you financially and physically he can’t even answer that question like what does that mean like me and him went from hella close to like strangers we broke up before but he never acted the way he was acting towards me now we use to have great conversations like we never broke up now he just act more nonchalant and dark and Ik something wrong because he never acts like this and I made a promise to never leave his side and I stood 10 toes on dat and I asked him have I ever left him ever he told me no, but if you a person dats so used to people leaving and you had a girl that never left your side ever why would you leave her it’s so much on my mind to the point where I blame myself all the time like was it my fault like did I show him something he wasn’t ready for or was I moving to fast we have been tg for 6 beautiful months one of my longest relationships idk what to say about the situation please help I need answers