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How do you respond to this predicament,
Apologize to the guy(s) and move on to another girl to hit on.
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how do you read whether or not they are dating before approaching?
Body language. If they are dating more than likely they will act like a couple, it should be pretty easy to pick up. If you for what ever reason can't pick up on this, then go out during the day and look for couples and study their body language. If they are not dating their body language will show it.
Exactly agreed with everything that jurupa said, the guy sais that she's his GF, you reply ''Hey man sorry I didn't know, respet to you you got the right girl man [high five him]

'' and then leave for another set, however a lot of times the dude'll respect you for saying this and the group often reels you back in, if two are GFs you still got a shot with third one
For BL, you'll see them standing more closely and together, holding hands, whispering, kissing of course...
Just hit the field and observe, you'll see it
