Most Helpful Guy
You couldn't take the time to type out "For real"?
As for the actual question; he's playing you. Anyone who dumps you because they see someone else they find attractive is not someone you want to date, if he dumped you once for a childish petty reason do you really think he won't do it again?
What you do is, you tell him to fuck off.
Most Helpful Girl
If you're kind of moving on keep moving forward. It doesn't matter if he's trying to come back, if he really liked you he wouldn't have left you for some other girl in the first place.