I hate writing this.

I’m not sure that the two of us continuing to “hang out,” or whatever it is that we’re doing, is in my best interests.  While I enjoy your company a great deal, it has become apparent that you occupy a larger space in my life than I do in yours.  We’re not in balance.  I’m not getting back the energy that I’ve been investing, and to some degree that’s my fault. Honestly, I haven’t been feeling very… valued, for lack of a better word, and that’s an important part of any interpersonal connection.

This isn’t a personal attack on MD, and certainly not a reflection of what kind of person I think you are.  It is what it is, as you’re fond of saying.