Most Helpful Guy
Just leave him be for now. Don't try to "convince" him because whether it's the "real" reason or not, he's made his decision. Give him space and time and he may just decide on his own that he misses you and wants you back. But either way, he'll appreciate not being pressured by you. Relationships alone can be very stressful, not to mention adding everything else in life, so it may just be too much for him to handle right now. But if you pressure him with "why?" or "what can I do" right now it's only going to have the opposite affect and drive him further away.
Most Helpful Girl
I ran away from my boyfriend too because he was stressing me out. If he decides to leave you like that from stress you should leave him alone. It is sadly the painful way to do it, but I can tell you, it won`t get any better if you contribute to his feeling of pressure. Maybe he will change his mind if you move straight on, don`t look back and show the world that you are still okay. Most exes are attracted to this. But for now, just let him go on with his decision. It will help him calm down, analyze the situation alone and peacefully without pressure.