Mine said a number of times they he could "come home and be miserable"; so he moved out (at my behest) and whether or not he's now happy is of no concern of mine. If he's happy--truly happy--them good for him. I tend to think not on the rare occasions that I see him: all he does is complain about things.
But, again, it's not my problem. When we can let go and stop worrying about them, their issues, whether or not they arerw happy, our life gets better.
And honestly, this question goes straight to one of the many things OP tells us on his first post: live your life as though they aren't coming back. We all know they might not or, if they do, we may not want them, a yeah. Let go and let the process happen.