Known her for a year, LTR for 6 months (unlimited sex, extremely submissive, will do anything for me, etc...) Occasionally when we’re out, I notice her checking out/glancing at other men. It happened a couple of times but ofcourse I don’t say anything or act bothered. However deep down it does bother me because I wonder about the reason she’s doing it. She always mentions how I am never jealous compared to her. Girls flirt/check me out infront of her and ofcourse that makes her very jealous.

Is it normal that girls in relationships sometimes do that?