I'm in my last year of high school and a guy friend asked

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just ask him
>hey a friend asked me to go to this formal school event, is that ok?
what is the event? like a dance?

>>17210616
just a social. hanging around and chatting and probably a bit of dancing.

>>17210603
No it's not okay.

... that's all.

>>17210603
What event is it?
Does your highschool friend know you have a boyfriend?

>>17210620
no but i'm definitely going to make that clear

>>17210626
Then after you tell the boy you have a boyfriend, tell your boyfriend
>Hey this guy asked me to go to "event" with him, he knows i'm with you and its platonic with him. Are you okay with it?
The boy will either not want to take you because you have a boyfriend or continue to want to take you as a friend.
I can't tell you what your boyfriend will say/do because I don't know his personality.

>>17210603
Do you want your boyfriend to go out 1 on 1 with other women?

If no, don't do it.
If yes, ask him if he's okay with it.