Is it normal to be jealous of your boyfriend's past relationships?
Mostly.Normal for most people
Yes, it’s pretty common to feel jealous about your boyfriend’s past relationships, even though they happened before you. The feeling is understandable; what matters is how you handle it together.
A little jealousy can come from comparing yourself with his exes, worrying you don’t measure up, or wishing you’d been part of his life sooner. Lots of people feel it now and then, even in happy relationships.
You don’t have to pretend the feeling isn’t there, but try not to turn it into a demand for every detail or a reason to punish him for having a past. If it’s bothering you, say what’s underneath it—like needing reassurance—rather than putting him on trial for old relationships.