What to do..

My husband and I have been together for 14 years and we have two children. He refuses to hang out with any men. Only wants to do things with me and our kids. He has no male friends. I’ve tried for years but he just won’t and I know it’s not healthy. He believes that once your married you should only do things with your spouse...has anyone else experienced this with their S/O?

I don’t know what to do but I’m at my wits ends with the whole situation because it’s making me feel uncomfortable and upset. For my birthday I went out with my husband and my best friend and he just made it so awkward and was almost trying to compete with her.