A girl who deliberately makes her partner jealous is manipulating him and showing immaturity. It's a red flag for a stressful relationship. There are better ways to understand someone's character without playing games.
If a girl is willing to purposefully make you jealous, then that means she is willing to purposefully manipulate your emotions. And do you really want a girl like that? I mean, that just sounds like a headache if you ask me. The truth is there are plenty of ways to understand who someone really is that don't involve messing with their heads and messing with their emotions. And if she is not mature enough to know how to do that, that in and of itself is a red flag.
