My boyfriend's female bestfriend from college is moving to his city and I feel unreasonably insecure
I (26 F) and my bf (28 M) have been in a long distance relationship for 2 years now. We've had a rough patch of around 7 months during which we broke up and he was with someone else. We eventually came back together but I've found it a little hard to trust him blindly after that.
Cut to present, his female bestfriend from college who is very close to him (or was, during college time) has switched her job and is shifting to his city. It's a very normal thing but idk why I've been feeling so anxious ever since I heard this news from him. I feel like they'll grow very close and he'll eventually fall for her or cheat on me.
They share everything with each other and she has even talked about her sex life with him. Although I'm not comfortable with them discussing such things, I never told him anything. The problem is I'm not as comfortable with any other guy as I'm with him, whereas he's equally comfortable with her as he is with me. Also the fact that I've known him for only 2 years while they've known each other for close to 10 years makes me insecure.
I don't wanna feel this way but I can't help it. I've been crying since morning which is so stupid and unreasonable. I'm feeling this way even before she has shifted, idk how I'll react when she actually shifts and they spend more time together, while I'll be far away. I don't know how to process my emotions in a healthy way without him feeling that I'm overreacting or overthinking.
What if I nag him so much with my insecurities that he runs away from me. Just wanted to vent it out.
TLDR: My LDR bf's female bestie is shifting to his city and I'm insecure.