Would this bother you?

I'm in an LDR and it's been official for about 2 months now, but we've been talking for almost 10 months and I finally decided I was ready to commit recently. We met online and he lives in Florida and I live in Pennsylvania and he comes to visit when he saves up the money. I've met his family and he's finally meeting mine this thanksgiving. Long story short, he loves me and I love him. We talk everyday and cam every week. His mother even calls me! This is my first "real" relationship so I'm still figuring out how to do things. Anyway, he has mostly guy friends, who know about me as well as his coworkers so I know he really cares for me, but there is this one girl who will call him every few months or so to say hi. Which was fine when he first mentioned she called, then he mentioned it another time and he gave her relationship advice she was engaged for like a week. I asked and he said he never calls her and said she's an acquaintance and the type of person that calls if she wants to dump her problems on someone or needs something. They hadn't spoken for six years. They dated for a day in middle school. My BF is really nice and he'll help anyone and give advice so I understand why she asks him, but I don't know if I'm being juvenile because I kind of don't like it lol. He rarely mentions her and if he does it's because she called. Which was 2-3 times over the course of a few months. We've talked about cheating in the past and he's against it completely and he saw how hurt his mother was when his step dad cheated on his mom. Am I overthinking things? Lol am I crazy or just a little naive in regards to the whole relationship thing??? Please help ☺️☺️☺️☺️