Why would my crush’s friend interrupt my conversation with someone else?

My current crush has been distant lately for reasons. Ever since that day, his buddy has been acting very strange around me. He doesn’t stare at me but he takes longer looks at me than anyone else. I know who he is but I never actually met him and it’s obvious he knows me from what my crush has told him. This guy also told my crush that I probably like him.

This friend of my crush knows a lot of the people I know. There’s a lot of times I’ll be talking to someone and he come up in between us and starts talking to the person I was having a conversation with. It’s almost like he’s trying to get into my business.

This is very odd because he always used to completely ignore me and now he suddenly is all up in my business. Any opinions on what could be going on?
Why would my crush’s friend interrupt my conversation with someone else?
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