There really isn't a Spanish word for "besties", but you can say "Mejores amigas" (Best girl friends) or "Mejores amigos" (Best guy friends or best guy/girl friends).
yes or the guy is just flirting with the girl
The slang term spelled besties can mean best friends.The form "beasties" is a stereotypically Scottish term for creatures or monsters.
That that girl thinks that that guy is handsome.
how old is she Treat her nicely and try to hang out and be besties then ask her out
it means that the guy or girl is with another guy or girl at the same time that they are with you
Decide who is more important and make decisions accordingly.
What do you mean by "Guy aids"?
The had sexual intercourse with that guy or girl
that means that they like being around that guy. it does not always mean that they like the guy but it could mean that they like to hang out with the girl. that means that they like being around that guy. it does not always mean that they like the guy but it could mean that they like to hang out with the girl.
In order to know that ask her besties they will know for sure.
Clarify what you mean. If you mean that a guy is bullying a girl, it means that he's being an @$$hole.