I know it's very difficult to be alone while watching others around you in relationships. Since it sounds like you have enough to keep you busy with your community involvement and activities, if I'm understanding correctly, just do what makes you happy and tune out the advice you don't want- including mine if it's not helpful.
There's a reason certain people don't make it into your future, so may as well leave it in the past and move on to someone who appreciates you. And as far as your exes- I tend to focus on their negatives when I'm done. It makes it easier to get over and realize they're likely someone else's problem now.