This kind of jealousy can be very difficult to deal with. My experience is that men who struggle with this type of jealousy are slow to change and often need extended individual therapy for true changes to occur. That having been said, I think couples therapy is a very good way to go for three reasons.
First, it will get the two of you in front of a neutral third party who can identify the patterns and offer feedback about how to improve the situation. Second, if the couples therapist thinks that your boyfriend (and yourself, for that matter) needs individual therapy, he or she can make that recommendation. Finally, it may be illuminating for both of you to understand your initial attraction to each another and how the relationship evolved to its current state.