My Boyfriend’s Friend Is Jealous Of How Much Time We Spend Together. Is This Normal?

“I’ve been officially dating this guy for about a month now and things are great, but I’m pretty sure one of his friends is jealous of me and how much time I am spending with my boyfriend. He will call my boyfriend multiple times while we’re on a date.
It is really disappointing because I’ve seen this friend turn from somewhat of a wingman, giving my boyfriend date ideas and hyping him up, to this. I’ve mentioned how I think he is jealous, and my boyfriend agrees. This is my first relationship, and I’ve been working through my friends’ similar feelings with them, but they’ve never done anything like this. Is there anything my boyfriend and I can do? Is this something we should just wait out, or do we need to talk to his friend?”
-Closet nob jockey