This is a little bit of a vent but I could use some advice. Im so lonely recently and i don't know why. 

My fiance broke up with me about 6 months ago. We discussed it the day we broke up but I was pretty out of it when that happened and I don't remember why, and she won't tell me again. I've been trying to get over it but haven't had any luck.
I've tried some dating apps but also struggle to get matches and the ones I do get I never get far.

 I can't seem to make any new friends and the few I had seem to be more and more distant. I don't really get out much as im pretty shy and don't even know where to start. All 2 of my old friends have gotten more distant and seem less interested in spending time together.

I was going to DBT until maybe 2 months ago but my Therapist/the group leader for DBT had to stop seeing people for some reason.

None of my co-workers really like to do anything outside of work, which i get since we're together 40+ hours a week. I just feel like a burden to them while we're at work and like I get in the way.

I just wish I knew why I was driving people away. My therapist said it's probably not my fault but this has happened all of my life and I can't figure it out. What am I doing wrong? What am I supposed to do? I just want someone, anyone, to care. This is maddening and I don't know what to do. What can I be doing with others? What can I do to make the loneliness more bearable?

I'm sorry this is long and jumbled.