Still in love with my ex

I broke up with my boyfriend of 3 years because his parents hated me and the only time I could see him was in school. This happened at the beginning of summer and now I see him at least three times a week in the halls.

I’m still in love with him and I know I should back off but it feels so wrong not having him in my life or being in his. I really miss him and I don’t know what to do.