Wilson hasn't bothered getting his own place because he knows that will be the end.
As long as he's living like a refugee from his own life, Lisa will visit him like one, refusing to even accept a key card. She'd rather knock on the door, be let in and push him toward the bed with its generically patterned coverlet, leaving long before it's necessary to put up the "Do Not Disturb" sign.
This is what she needs, so gives it to her. He's had "real" relationships and look where those got him.
Living in a hotel, waiting for her.