>>7389158Sorry that things have started to turn bad for Anon. However, don't give up dude.
From your description, it seems that your primary issue is that don't appear to be socialising outside of work conditions. Humans by their inherent nature are social creatures. I may have read your situation wrong but I'm kinda in a similar situation to you but without losing the girlfriend. Only thing I can suggest is start making some of those activities involve others such as getting a workout partner, getting involved with a band or even a fucking book club.
Hope it works out for you Anon