Boyfriend wants to see a therapist before he can say that he is 100% committed to our relationship? Okay...?

He loves you and wants to be with you but something is nagging at him. Consulting a professional to figure out what that something is should be commended. He's making sure that he doesn't have any unresolved issues that could be detrimental to both of you AFTER you get married. This is really no different than going for pre-marital counselling. He's working out his crap first.