I'm sorry to argue with you PF but if you redefine detached so that your obsessing over him and his facebook posts is just studying him clinically, you're seriously kidding yourself.
There is no reason why you need to study him, and plenty of reasons, which are being cited repeatedly by people here who've gone before you, to stop paying any attention at all to what he is doing.
For your own sake, you need to go cold turkey from this addiction to him that you have, and keep working on building your own life.
Adinva 51, S20, S18 M24 total 6/15/11-12/1/12 From IDLY to H moving out 9/15/15-3/7/17 From negotiating SA to final D at age 50 5/8/17-now: New relationship with an old friend __ Happiness is a warm puppy.