i feel lost !!

I broke up with my boyfriend two weeks ago because I found out that he was lying to me and talked **** about me through screenshots from a discussion between him and his bff on Facebook after that his bff s account was hacked. We are in the same class so I see him everyday. I am not going to lie but I still have feeling for him . I cought him a few time staring at me and we made eye contact , at that moment i feel so weird. But my mind is telling me if someone that had the dare to lie to you in your face and talk like that about you then he doesn t deserve you .today when we was in class he didn t take his eyes of me like the whole hour the moment i turn i found him looking at me . But in the same lesson he had a problem with the teacher and the taecher slapped him in front of the whole class i felt like i was the one who was slapped not him , i was talking to my friends and holding my tears . I feel lost !! What do you guys i should do please but we can t never get back together . Please tell how i can get over him !! PLEASE