have you tried telling them both how their behavior upsets you? i would try telling them that if they truly care for you and want you to be happy they should both trust that you wouldn't let the other hurt you, as well as asserting that you're your own person and their "territorial" behavior is completely unacceptable and unnecessary since your relationship with one of them won't cancel out your relationship with the other.

That's actually a really good idea. I think I'll have the discussion with them separately since they seem to listen better without the other present. I just hope I can get it through to them. They're pretty hard headed, but saying that kinda makes me the pot calling the kettle black. Haha! Thank you for the advice! :D