what do I do??? please help

yes ima 14 year old girl im not a virgin and yes I know its bad the person I slept with I am very close to him but were not together its like very secret but hes allowed to go round go out with other girls have who he wants but I just started talkin to this lad I only met him once his names simon! this simon sed he really likes me but the thing is hes with someone called leanne there have relationship problems at the moment! and frantically he sed he dont wanna sort um out he sed he wants to get to know me more and maybe think bout me and him!!! do you think hes usin me for one thing! im not sure anyways the thing is the person I slept with I think I really and truelly care bout hiim! and in some ways he cares bout me! but then again he sleeps with who ever he pleases! but theres just summat bout him I love! I dont know weva to just ged rid of him or keep him as a friend( I mean hes there for me when I need him most and that weather its bout friends or family) I dont know what to do about simonn I think hes a great guy! I just dont wanna make the misteke of leavin someone I may love or have feelings for… for the one I like! please help what do I do?