Why do guys tend to do this?

So I went for work drinks with my grad friends and we had pres as well and I’ve become really close with one of the guys at work and he’s been one of my best friends there.

before we weren’t as close so before at parties he’d just say hi but now that we’ve become super close we always stick with each other so keep a bit later then everyone else.

he arrived and he came and said hi to me and complimented me and said my hair looked good. And we both just sat with each other the entire time and then we went for dinner afterward with everyone and we were super close with each other.

Do guys tend to do this where they only stick with people they are super close with?

Why do guys tend to do this?
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