Is it normal to be jealous of your best friend having other friends?
Mostly.Normal for most people
Yes, it’s normal to feel jealous when your best friend gets close to other people. The feeling is understandable; what matters is not trying to control who they spend time with.
A close friendship can feel like a safe little team, so seeing your best friend make other plans may bring up a fear of being replaced or left out. Lots of people feel that sting sometimes, even when they’re genuinely happy their friend has other connections.
Try to notice what’s underneath the jealousy: maybe you miss spending time together, or you need reassurance that you still matter. You can tell your friend you’d love to plan some one-on-one time, without asking them to drop their other friends. Friendships can make room for more than two people.