can't stop thinking about him💦💦👿 plz help

so i dated this guy for a few months and he said he loved me and i loved him too and we would always talk about what our turn ons were and we would sexually tease each other a lot but we're both virgins. later i broke up with him because i found out he cheated on me. 4 months later we stated talking again and since then i can't get him out of my mind like i've had so many wet dreams about him and have a LOT of dirty thoughts about him. i see him everyday at school💦💦

how do i make it stop? or should i just give in and get back with him?