HOW WOULD YOU TAKE THIS HELP ASAP !!!?

me and my boyfriend have been going it since 4-14-11 and when i get jealous its kind of bad , he has a friend that's a girl (shes bi) and he has skipped in the woods with her and i even cought him wearing her skinny jeans ( playing around =/ ) and we only talk at home on the phone i have only 1 cl with him & he has 3 he spends alot of time around her and it buggs me am i paranoid and having my jealousy thing agin or should i be worried and how should i handle this ?? Oh yeah i talked to him tonight & i was so fed up the convo ended with me saying " you know what i honestly dont care if you hang up or not and i dont care about you so BYE" he just hung up after that HELP!!!!