yeah i think there is a serious problem. you need to work on your jealousy and fear dude, or you are likely to push her away such that she WILL end up cheating on you. its a sad sad situation but all too frequent that if someone becomes totally obsessed with the idea that their partner is cheating... precisely that can cause them to cheat (when they wouldn't have done otherwise).

part of it can be about... a funny idea of 'being jealous shows her i really love her'. except... it doesn't. it is like being jealous shows her that you don't trust her. and... i guess you don't trust her. it is like you think that she can only be friends with one person and if she hangs out a little with someone else then she can't be friends with you.

i hope you guys have the birth control thing figured out now.