<human>: I'm [17M] and have been VERY close friends with this guy since we were little kids. I got a girlfriend 2 months ago who is best friends with my friend's GF as well. When it started out, my friend and GF weren't friends at all except through me and his GF. Now, only knowing through my own girlfriend, they talk regularly about their problems and have been having hour plus phone conversations and video chats. It's happened a couple times I guess. What I'm uncomfortable about is that my friend doesn't share anything with me when this happens, and I only hear from my girlfriend and even then in very vague terms. So they end up knowing everything about each other problems, and I'm feeling completely out of the loop and weirded out by the fact that my best friend is discussing issues with my girlfriend and keeping secrets from me. I can't tell if I'm being too insecure or paranoid, but it's driving me crazy wondering what they're talking about and what I don't know. Aghhh

Can you summarize the given text in a few sentences?
<bot>: My long-time friend is becoming VERY close to my girlfriend through emotional conversations, they keep secrets, it's weird.