Try to spend more time with her and watch her patterns. If she has a boyfriend she will probably spend alot of time around him particularly during after-school activities and such. You could also find out who her friends are and ask one of them in confidence, or talk to her and casually bring it up in conversation without asking (like bring up a topic which will more likely than not lead to the divulgence of her relationship status)
ask
Just tell her that you don't like her that way. Tell her that you want to just be Friends not boyfriend and girlfriend.
tell her that her boyfriend cheated on her. she needs to know.
Don't tell her you love her, tell her you like her.
if i where you i would tell the girl that likes that boy that he has a girlfriend.that is what i would do.
Tell you her your feelings about her
You should tell the other girl and both break up with your boyfriend.
Tell him the truth, say you like girls.
There is only one way to tell: you have ask her.
Just tell him gently....."listen, I have a boyfriend. Just saying"
Well then the girl is being cruel and needs to lay off! If they actually like the boyfriend they can accept that the guy is happy (NOT at the discretion of the girl).tell the girl to lay off and if they don't, tell the boyfriend the girl is lying and and why so you can leave the decision to him.The girl should not believe the not-so-friend because she has to ask her boyfriend first. You cant just believe someone about your relationship without asking your boyfriend first. You should trust him if he's normally a trustworthy guy and if he doesnt have a history for cheating. He would tell the truth about it and just tell the not-so-friend to leave you guys alone and say your friendship is O-V-E-R.
You ask