Boyfriend’s female friend barely speaks to him when I’m around, but when it’s just them she speaks to him a lot?

I recently met my boyfriends female friend on a meal out with some friends a group.

My boyfriend says that usually she comes up to him and speaks to him a lot.

However, when we were out she didn’t even say hello to my boyfriend until he did and she spoke little to him throughout the meal, which I’m pretty sure was due to my being there.

Why would she do this though? Surely if they’re straight up friends me being there wouldn’t matter?

Boyfriend’s female friend barely speaks to him when I’m around, but when it’s just them she speaks to him a lot?
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