Ok me and ex went out for a little over a month

We had (like other couples) our ups and downs. He was a GREAT boyfriend. In between classes he would always stop at my locker to give me a hug and kiss and would call and text me everyday for hours. He was charming, funny, cocky and one of the closest boyfriends I ever had. The problem is that we broke up around 30 days ago. He went out with about two girls since then. I still talk to him in school and by text. I never got completely got over him and I just cant FORGET HIM. I really want to go out with him but im not sure if he still likes me. Almoast everyday when I see him I just feel like crying because we were so close

(yeah, I know one month I shouldent have all thease feelings but I do) and it makes me sad that during classes I dont get a hug and kiss from him. I especially get jelous of him when hes dating another girl

I dont know what to do if I should like tell him how i feel, ask him out, write him a note, ect.
Please help im so confused