Hi Karrets, are you doing anything to stop this finally ending? Is there still a connection with him? That might make you feel like your life is still on hold. Check yourself to make sure you've severed the ties.
If you're depressed, don't be afraid to talk to your doctor about it, as depression can feed into itself and stop your recovering. If your doctor recommends anti-depressents, why not try them for long enough to get you over the hump?
Maybe take on a challenge where you have to get out and meet people. You might decide on a half marathon, or learn oil painting, go on a trip, renovate the garden. Set yourself a goal for something that will challenge and stimulate you.
Being alone is not, of itself, an evil, it's how you handle it that counts.