Most Helpful Guy
Forget about him, you have to let go of him if you want to be free from the emotional burden and not continue to feel unhappy. If he gave up so quickly from a single minor fight, he could easily give up on even BIGGER problems and MORE important things and abandon you to deal with them on your own all to avoid any responsibilities. So, would you be willing to risk those kinds of situations? Even if you can be together with him again?
Most Helpful Girl
The fact that he ghosted you and refused to take your calls is a pretty clear indicator that he is not interested anymore. You're putting too much importance on that App and you are failing to see that being dumped by a less attractive girl has nothing to do with looks but with how she made him feel. You guys are young and should be dating. Maybe work a little on your personality and swipe to delete and move on.