If somebody is in a relationship please, respect that. Respect that they're currently off limits. Respect that they're not available to you. Respect that their boyfriend/girlfriend will be uncomfortable. Don't flirt with them 'cause that's disrespecting their relationship & their boyfriend/girlfriend. Let's say if they leave their boyfriend/girlfriend for you, how would you know if once they're yours, someone else won't come along & steal her away from you like what you're trying to do? Would you like that? No. So don't be a home wrecker.
Exactly what you would expect that girl that you are with to do if some guy likes her but she is with you, fair enough?
Look at them and say to her do u want to go out for lunch
ask her who she likes
Get to know her.
this is simple get to know this girl
If a guy look at the girl twice then it means she likes the girl
That means he girl likes you and answer that question by telling the girl something she likes to do. If you don't know what the girl likes to do then you're a goner
Ask her.
ask her out
If no on likes you
if she talks to you and touches you on the leg or something like that. then that means she likes you.
I gess the same way you can tell if a normal girl likes you.
go to 'ask' and type in 'how do you know if a girl likes you' you should find all you need there
just ask her if she likes you