dude,
i miss my ex too. she went on a vacation with another guy. and it kinda sucks to be in my shoes now. imagine right after we broke up, that guy was always there for her. But if she's happy with that guy then so be it.
try to get your head back straight. i'm working on that too. and maybe lay off girls for a few months. if u do want her back, call her out for coffee or a lunch. start gaming her again. in a R/S it's always sweet in the beginning till someone stops doing something.
Ask yourself, how long can a rebound last?