How does a guy's friends act when he has a crush on you?

Anonymous

This involves 2 guys and I'll refer to them as guy A and B to avoid names.

Guy A - we get along well and I have strings suspicions he likes me. All the signs are there (body language and otherwise). Always helps me with stuff without being asked, smiles and laughs a ton around me and makes eye contact. Also stares A TON (every time he sees me).

Guy B - a friend of Guy A. I just met him a couple weeks ago when Guy A brought him over to me. He is now nice to me (never was mean, we just didn't talk or anything).

So today, Guy B was being really weird around me. He acted way different than normal. He was using my name a ton (usually doesn't do that, especially so much), kept finding reasons to come around me (also doesn't usually do that), and included me in an inside joke with someone else. He was being really "pesky" - wanting to bother me a ton and interrupt me when I was doing stuff. He usually doesn't say much to me, but today he was talking a lot and even playfully teasing me a little. He made a weird comment too (he told me the small/little girls were the "fun ones" - I am a small girl/petite). After he said that Guy A came around and Guy B got quiet then they both left and started talking privately.

Why would Guy B have acted so weird today? If a guy likes you, do his friends usually act weird around you? Was including me in the inside joke kind of a way to make me a part of the "group" so to speak? Would you assume Guy B's behavior probably ties into Guy A? Me and Guy B never spoke once until Guy A brought Guy B over. Even after that first meeting, Guy B wouldn't really talk to me a lot. Guy A does - Guy A finds all sorts of random reasons to talk to me.

I am just really confused by all this and would like opinions. Especially since Guy B was behaving out of character today.

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*Strong, not strings. Stupid autocorrect lol
How does a guy's friends act when he has a crush on you?
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