Call his 'friend' or knock on her door. Even if she says nothing to you, you will know by her demeanor/reaction. You are only hurting yourself to put up with this for as long as you have. (I lived with manipulative, demeaning husband for 20 years and now that it's over - I realize that I hurt only myself by staying.) Deep in your heart you know. Even if it is platonic - you would not feel this way and he would not treat you this way if it was right between the two of you. Don't let him talk you into (or out of) anything because you want it to be true.