u/anythingroredabout

I had an ex when I was in the middle school (we were just kids I know it was pure love ) and we broke up a 3 months after it or smthg like that I don't remember exactly. Now am in college and me with this person we were talking to each other from time to another but we were like friends not exs so everything was fine once one of his friends texted me I talked to him for two days or 3 but I didn't mentioned that his friend was my ex because that was a long time ago and I really get over it plus I wasn't planning on dating him it was just talking then my ex of middle school tell his friends to stop talking to me and came to me and blamed me for talking to his friends and he didn't like that ( I think he gets jealous) it was fine by me at the moment. That happened at my first yr of college. And now it's my third year in college same thing happened one of his friends talked to me online and I told him about the situation that his friend is my ex is he fine with that he said no prolm two minutes later my ex of midd school texted me and he was so pissed and mean to me I talked back ofc but he was very mean. And our friendship is over because of that. Well the things that I couldn't get it is why did he get mad? He stills having feelings for me? Or he didn't like me talking to one of his friends and why ? And I really need ur opinions if it was my fault and why and what should I do in this situation cause am feeling so sad about it it literally made me cry I thought he is my friend and won't hurt me like that with his words he was really mean with me in this situation should I talk to him and try to make things better even though he was being rude to me? Or I did the right thing by ending this relationship am lost pls help me