Backstory: I met this girl on the beggining of the year, she's from my class, we started talking a lot but nothing more than this, long story short, she's dating a guy 5 years older (she's 15 and he's 20) and i obvioulsy got a little angry with this, she said to me that she would have slept with me before meeting this guy but now nothing will happen...My friend told me i should keep her around and when she broke up i go there and talk to her about us, but i don't know if i can make this because i kinda like her and can't stand when she talks about ther other guy...What do i do?

ps: forgive my english, i'm brazilian