If feelings are still raw, don't go trying to find someone else 'on the bounce', wait until you've got over the past relationship. It fades in time, especially if you get yourself to accept the reality and simply acknowledge thoughts of it rather than use them as a trigger to brood on and stay sad. Go get involved with other interests in life that are not relationship oriented. You must have interests. And socialise with friends who may raise your spirits. They can't always be busy, or they haven't organised their lives well. If they are, find some new ones to add to your present ones. Maybe join a club or something similar.
(Oh, and by the same measure, envy (or jealousy) is something you need to learn to control. No one can do that for you, it's about self improvement and becoming a better individual.)
Good luck.