I hate living alone and feel like a failure

For context, I got out of an abusive relationship last year and ended up moving to London which is about four hours away from my hometown.

I came from a small hometown growing up which was full of nature and all my friends and family live there. I wanted a fresh start for myself after living with my abusive ex boyfriend for 5 years.

After living alone for three months, I've realized I HATE it. I have ended up chronically depressed, anxious and my OCD is flaring up bad. This could be the relocation but being alone actively makes me really frightened especially given that I feel I'm in a mental health crisis.

I have a boyfriend down here and he lives alone too but he loves it and doesn't want to move in until we're almost married.

Did anyone else feel like this? What do I do until the end of my tenancy? By the way, I have a cat.