Abstentia Dementia
The description of a man's state of mind when sex in a relationship dies off. The word abstentia comes from abstinence and absentia. You'll often see him gazing off into space, drinking more than usual and in some cases, weeping like a baby.
"Dude, is everything alright? You look lost!"
"Sorry, it's just my abstentia dementia acting up again..."
"Sorry, it's just my abstentia dementia acting up again..."