A wandering eye in a relationship can stem from deeper insecurities, anxiety about one's choices, or a lack of fulfillment rather than simply being a character flaw.

“it can also be a form of anxiety. The constant anxiety of have I picked the right person? Could I have done better? Is there someone better out there for me? Have I made a mistake? There's an anxious pattern of thinking to looking around the room all the time when you're with your partner.”