How about you make a copy of your post and sit down with him and let him read it? I mean, if these are your honest thoughts and feelings, then I don't think there's anything wrong with you setting the boundaries. If you feel like he's encroaching on your personal life, he needs to know that he has to give you more room. How else will he know? If he takes issue with how you feel, well, better now than later. Now, as far as his betrothed is concerned... I think you need to let everyone know where you stand and let THEM figure out what their relationship is. At least you will know that you set the boundaries that you're comfortable with. Then the ball is in his/their court.

Dan