Is it normal to be jealous of your partner's ex?
Mostly.Normal for most people
Yes, it’s normal to feel jealous of your partner’s ex sometimes. What matters is how you handle the feeling and whether it starts affecting your relationship.
An ex can bring up comparison, insecurity, or worries about your partner’s past—even when there’s no real reason to think anything is going on. Lots of people feel a pang of jealousy now and then; it doesn’t automatically mean you’re controlling or that your relationship is in trouble.
Try to notice what’s setting it off and talk about the underlying worry without blaming your partner. A little reassurance is fair to ask for, but monitoring their ex, picking fights, or trying to control contact can turn a normal feeling into a relationship problem.