Husband has more in common with female friend

I just kind of need to vent ladies. No judgment please.

Me and my husband are very different people. I grew up as a football lover. I love camping and other out doors stuff. My husband is the nerdy type. He loves animals, Harry Potter, Magic the gathering, dungeons and dragons. All that stuff. Even though he's not a fan of the stuff I'm into, he still watches the game with me and we've gone camping a few times. One of his friends recently brought a new girl to the group. I guess his friend was friends with her at college. We met her at his friend's house and my husband and her hit it off right away. She had a Harry Potter pop socket and nothing will get him talking faster than Harry Potter. He asked what her house is. Of course they're both Hufflepuff. He asked if she had to pottermore and what's her wand and patronus. Then they got to talking about anime and since then they've been great friends. I've seen their text messages and it's mostly them talking about fan theories and anime and Star Wars. I'm not the type of person to tell my husband he can't be friends with someone. I don't roll that way. But I won't lie. I'm super insecure. My husband meeting a girl who's exactly like him and into the same things, not to mention shes very good looking, just makes me insecure. When we all hang out hes talking to her about Star Wars or looking at their magic the gathering cards. I'm glad he has friends he has things in common with. I just feel sad and insecure that me and him don't have a whole lot in common. The biggest thing we have in common is our love for the musical Hamilton and I've been meaning to ask if he wanted to watch it on Disney+ but I've just felt so insecure and like he wouldn't want to that I didn't even bother...

I want to make something. It's not necessarily that I don't want him to be friends with her. I'm glad he's making friends. I'm never gonna tell him not to be friends with someone and he would never do that to me. I'm just venting my insecurities. My insecurities aren't his responsibility they are mine and I understand that. I just needed to vent my feelings.