Is it normal to be jealous of your ex's new girlfriend?
Mostly.Normal for most people
Yes, it’s normal to feel jealous when an ex starts dating someone new. It doesn’t automatically mean you want them back; the feeling often fades as you move on.
Even if you were the one who ended things, seeing your ex with someone new can stir up comparison, hurt, or the odd feeling that you’ve been replaced. You can miss the attention or familiarity without wanting the relationship back.
People handle it differently: some barely care, while others feel a pang whenever the new girlfriend comes up. Give yourself a little space from updates if they’re making you feel worse, and try not to turn the jealousy into a reason to interfere with their relationship.