Dude I've been in that exact situation.
I lost pretty much a whole group of friends over it as well. The problem was I still loved the ex at the time and thats what screwed it up.
I don't know if I should give any advice because I just left all those friends and found some new ones (thats how I come to be here).
Now I've spent over a year completely single, not even a date. But I'm doing pretty good.