This isn't advice its just the ramblings of a 66 year old geezer.
I've had this situation three times and each time it became easier to accept but still very painful, it was like an old friend to me, revisiting and knocking at my door. The worst time for me was through the night when one wakes at 2.30 am with that feeling as though your heart has been ripped out and also the realisation you're not with the one you love. She's on your mind all the time, what went wrong, could i have been a better husband, i want her back?
To be honest, and when i was younger, and it was easier then, i found being in female company took my mind off it. I don't mean unloading on someone, i mean, i used to pull someone down the pub or a club just to be in female company.
If i were you i would avoid listening seriously to "throw-away comments" from people who deserve to be alone, but just remember that it's your ex's loss.
If you feel the need to have a drink, go out and socialise, meet new people and try enjoy yourself. People you know will depress the hell out of you and constantly remind you of your situation. Don't drink at home alone
Good luck my friend, hope the wounds heal soon.