Sometimes it's easier to keep making a mistake than to change your whole life plan and rock the boat and cast yourself into the unknown. Plenty of people do it. I suspect he will stay until it gets more painful to stay than it does to leave.
Madness string 111941
You know it's okay not to know something right? That's perfectly normal and human. You didn't study psychology so of course you know less about it then someone who studied for x years. You don't need to be embarrassed about that.