My boyfriend for 5 years is now my ???

I (f26) met him (m25) at uni, we had our ups and downs, but I considered him to be my SO and best friend.

I’ll just narrate the end; about a month ago he changed and stopped talking like he used to, he fought everytime he talked, then he said he needs a break but he always came back after a day or so saying “I miss you”.

He did it more than once to ignore me for a day or two then speaks whenever he likes to.

He knows that I have sleeping problems, and sometimes he chatted with me all night just to be there. But when I complained that he was detching me, he was also the one to say “you’re grown up now, you should sleep by yourself.” Though I mentioned nothing about sleeping which really hurted me. Of course he’s not the one to make sleep and no one should bring it up like this if they supported me during times of thickness.

I spoke to him more than once and tried to figure out what happened or why does he ignore me like that, he had no valid reason and he didn’t wanted to talk about it, he just wanted me to ignore his behavior and act like nothing happened.

He said lots of things like “you’re the reason”, “it’s all because of you.”, “you like fighting”, “I am scared to talk so we won’t fight.”

Then he started being really cold, he didn’t have any reason for doing this to me, I am the same girl he knew for 5 years, is he discovering all of a sudden that he can’t stand me now?!

He also said “ I don’t wanna be in a relationship where I am everything.” Well it’s also the same relationship he wanted for five years. He never complained when I told him you’re my everything! He never stopped himself from saying to me that I am his everything!!

He didn’t have any reason for letting me down like this. Yesterday day I lied to him and told him that I am talking to someone else. Yesterday I gave him a reason.

There were times when I had other friends, but for a year now he was my only friend.

I might get along with losing my SO. But I am having a really hard time losing my best and only friend…

TL;DR my SO and best friend for 5 years started ignoring me a month ago and practically not in my life anymore.

EDIT: He was never like this, He’s always been there to support me while he can, he spent whold nights up with me just so I finish an assignment, or do a project, he encouraged me to study and apply for jobs, he was the happiest when I got my first job 2 months ago. He also provided great emotional support. But what happened a month ago? I guess I’ll never know.