overthinking?

I’ve gotten really close with one of my friends. He confides in me and I confide in him as well. He’ll tell me something like today was terrible and ofc I ask why what happened. He tells me or will end the conversation with , I really appreciate you, it means so much that you care, or thanks boo (if I give him advice).

The thing that I keep questioning is why he confides in me and tells me about his day because he’s married.

Am I overthinking this? Am I getting too close?