Help ex-boyfriend trouble!?

My ex-boyfriend, a really cute, nice, funny guy, i saw again. but he's not really my ex.. he just had to move away to boarding school so bye bye hot boyfriend. but then our school visited his school.. we kind of clicked back again :) and i saw him again but so did another girl in my class, who is pretty. She likes him and is thinking about snogging him (without telling me ) :'( he is coming to where i live on the last day of school to go to a club/disco thing. I think he still likes me and i like him too but i don't want to seem forceful. Also i've never snogged anyone before so will i snog somebody before him? I don't want to tell her to back off either in case he likes her instead and i chicken out or he snogs somebody else :O it sounds confusing because it is :( please help :P I'm 14 btw..