There's no reason in the universe why you can't find other roommates and move out, and keep your job. This will also not ruin your friendship. Just say, "I was looking for a change, as I feel we all hang out together so much, it's keeping me from meeting new people."
Which is the truth, BTW.
Years ago, I lived with guys (I'm female) in very similar situations. If anyone got attracted to anyone else, that effectively ended the living arrangement. And that was no big deal. Better to end the roommate situation and date, than to stay in the same apartment, pining, and potentially destroying the rental situation. Which tended to be more important than boyfriend/girlfriend stuff (yes, really -- you don't know misery until you have a lousy roommate).
I used to meet their girlfriends (and vet them!) and often became friends with these women (Darragh and I were definitely pals; others, not as much). They met my boyfriends -- and Pete definitely did not
like Guy. He was okay with Jim, as I recall. Weird; I'm FB friends with both Pete and Jim, and it's almost 40 years later.
It's different, of course, when it's a long distance relationship, particularly as he's throwing off mixed signals about his status with her. Are they dating, or not?
I get the feeling they are, but he's hedging his bets and wants to date your coworker.
So, I'm sorry, but you're
the one on the outs.
I truly think you should
move out, and for the exact reason I've outlined. And go and meet other people, at work, in the neighborhood, etc. Not just men and not just for dates, but to have a social life outside of your living situation. This doesn't mean you can't have fun with your current roommates. Of course you can!
But it will be a lot easier for you if you can end the fun times with going home to your own apartment, with your own stuff and your own key and lock. I think you'll find the infatuation dies down if you're not in each other's faces quite so much.