Boyfriend problems?

ok so im 14 and i've been with my boyfriend Trent since Feb. 07. when we first started dating it was perfect it was like love tht i cant even explain. we would talk on the phone all night and everything. but then people at school started trying to break us up by telling me hes a cheater and thn they would go tell him im a cheater so me n him got in fights. that was a couple months ago. i started hanging out with this dude named cole cuz we r rly good friends and trent got rly rly jealous and now i think hes trying to make me jealous by flirting with this named dianna but hes been rlly nice to me @ the same time. can anyone plz tell me wut i shuld do?!?! i cant dump him cuz we tried breaking up but we both got a horrible, alone feeling when it was over so we tried it again and are currently trying to work things out but i still feel like he likes dianna. he admitted to likeing her at one point but says he doesnt now.