I feel so alone

I feel so alone and it's partly my fault .

I have an amazing partner but so many of my friendships have fallen apart and now i have noone left. Or the friends I have left don't really care about me. I'm always trying to reach out etc.

I had a long term friend since we were young children all of a sudden block me.. We had a bit of conflict when I felt her partner was rude to us. She got offended when I mentioned it. But we had made up but then she randomly she blocked me one day.

I've also had another friend go cold on me after she got in a relationship. She not longer cares and don't ever hear from her.

I dunno how to start again. I feel so alone but also claustrophobic in my own skin and out of control

Anyone have advice