Should I reach out?

In the beginning of April, my now ex boyfriend broke up with me out of no where with little to no explanation and Its been bothering me all month. I blame myself constantly and I just want to know what happened. We haven’t spoken in weeks and I just miss him so much, he was my best friend... We go to the same university and I am about to move home for the summer in four days. I really want to talk to him beforehand. Should I text him asking if we can talk?? Or will that make me seem pathetic?