Insecure and he is not helping!

Lily
So I while ago (like not even 6 months ago) a messaged me on this site called meet me...he said some cheesy pickup line..... and that was the end of it until I saw that he was on my schools wrestling team... Well then maybe 2 months later I got another message from the SAME guy and we ended up having a semi flirty convo and he asked me if I where I went to school and it came down to where I started seeing him in the hallways and I knew he saw me on several occasions by him taking double takes at me in the cafeteria and him actually standing and looking at me as I had a conversation with my mom in the main office ( where he is an aide)... He's cute and I find him sort of attractive despite him being a little shorter than me but he never once tried having a conversation with me or even said hi as we passed each other... I am dealing with a weight problem and this has only led me to feel that he thought I had a pretty face but then saw me as an entirety and was like no thank you... Can someone please!!!!! Help me figure out what I should do! Should I just let this "thing" go... Talk to him? I'm just highly frustrated and need a second opinion!!!!