If you are sure that he really really likes you, then he is probably going out with her to make you jealous. However, you should not try to break up his relationship by telling his girlfriend this. Though you may want to, this will hurt the girl more than you realize. She may not be able to find love for a long time due to the thought that people just like to use her. You shold confront him, when he is alone, and ask him if he is using her. If he says no quickly, then he either is using her, or cares about her more than you can imagine. Just let him know how you feel and give him his time. :)
Well, if he really likes you that much, then he will leave his girlfriend for you, and if he doesn't, then he is not worth it.
tell them that you respect people and there relationship
Find a nice hobby to refocus your attentions.
It means she only likes another guy's face!
Go for the guy
It's ok for a girl to go to a dance with a guy but if the girl likes the guy you may want to go to the dance with her not him!!!
Find another girl or risk getting hurt
she is simply a lesbian.(wants a girl/woman likes a girl/woman she is a lesbian)(wants a guy/boy likes a guy/boy then he is a gay)
no
she likes him too. get over it
he will try to be mean to her because she does not whant the girl that he likes her.
It means that the guy also likes the girl and would like to go out with her.