I met wonderful girl, she is 20 years old. she havent had any releationships or boyfriends, she is like the "right" girls. Always when I met her we were more than two, there was another people too. I met her once a week. After about month I decided to ask her to go out, that we could drive to any beautiful place...
she''its a wonderful offer, but... how to say, its too late..''
it was dark outside, i thought that it was about that so I asked again
me' 'yes, maybe its to dark outside and tomorrow is working day, but I really want to meet you tonight, could we just go out near your house, we could walk and talk about some nice things?
she "no, you didnt understand. I would really, really want to do it, but now it wouldnt be honestly to someone else. "
me "its better to say straight no, because now I feel that you are not sure about your decision!"
she "i just cant say straight no. "


ok, so she has boyfriend now. I know, that month ago she was free ..
as I know her sister's boyfriend. 10mins after I asked her to go out, she texted to her sister about that, so her boyfriend texted me to keep on trying, that I need to try again. Next day I called him, he said again that I need to try, but it will be hard because she is not a slut but really loyal girl ( I dk if its ok to say reliable in english? ;D).
she was always little bit shy when I was talking with her, little bit attentive, she likes my jokes and I just feel that she likes me.

its really hard for me to make decision is it worth to do something. but I need to do it now while they are just starting relationships. (maybe they are just meeting and nothing serious, i dont know).
So how do you think? And what could I do in this case? Please help.