Hey, I don't think its a good idea to talk to her. Infact I don't see a reason why you should stay in this relationship anymore. Even if she decided to help you, she can't really because the problem is not with her, the problem is with your boyfriend.
His actions speak for him not his words- know and understand that. If he has not iscussed marriage till now- that is clearly not on his agenda. Besides, listen to your inner voice which is telling you that he is not right for you. You have all your answers already- just be brave enough to cast all feeling aside and do what you know you must
Please do yourself a favor and get out of this.I have been there and I know exactly how hard it is to let go of what matters most to you. But believe me, I am glad I did. And I can guarantee that you will be too. Just cut it right here.