Hello, I have never posted to you before, but I have read your thread and have great sympathy for your situation.
Do not feel bad about setting up boundries. Being out of the home 3 years is quite a time, tho I know MLC can last, commonly 5+ years. On one hand you are advised to GAL, but you are also supposed to hold your life while MLC'r flounders.
Sounds like he wants the security of a "mommy"/wife/home, but not the commitment of being a husband.
He says he is 80% sure? Sure of what? What is his 20% of confusion about? Does he say?