Still confused

We were together for 3+ years. I just don’t resent the breakup, neither the time i spent with him. It’s the fact THAT I PUT HIM BEFORE MYSELF!!!! And he left me alone last night while i was crying and having a very rough night myself, and it just didn’t work out. You don’t expect it from someone you’ve been together with so long. I don’t care if he tries to come back or whatever i just want to make myself stronger, so i know that i will not let these things happen ever again to me by him or anybody else ! Things fall apart because of both people in the relationship so i accept the things i did too. Yea that’s just abiut it. If you read this, hope you have good day, and you reach out to somebody or somewhere even if posting on this app works. Bye☺️