How do I stop being clingy to this guy?

Theres this guy at school who I thought I was good friends with. I'd see him like every other day whether its at school or just hanging out. Well just the other day we hung out for two days in a row, it was all fun then he invited me over to his house and bought me some food. Then he preceded to turn into a bit of a jerk and told me that I wasnt that great of a catch and the guy I was dating wouldn't want to get stuck with me and would break up with me? I left and gave him some space that night(I usually at this point would have texted him goodnight) and texted him the next day and asked what was up. He then texted me back and said "nothing", now its the day after and I saw him in class. I barely acknowledged him and left early cause I finished my test. I feel kinda bad because I keep looking at my phone hoping he'll say something like sorry, or I was busy. He's admitted to me that I have a loneliness about me and that I get attached to things easily. Was his being a jerk to me his way of putting some distance between us?