<human>: So I am pretty close friends with my crush, let's call her Abby. She's funny, kind, attractive, organized and hella driven.  She's a senior in hs, I'm a junior. We eat lunch at school together, we talk every day, we hangout every once in a while. Definitely friends. 

Recently, I found out that she likes another guy we both know (i'm 80% sure), also a senior, lets call him Matthew. I'm also friends with him, but not close friends. Matthew and Abby have been low key flirting for a while. They aren't going out yet, but it seems likely they will soon. 

I didn't learn that Abby likes Matthew because she told me, but through another girl in our friend group. (Incidentally, she is Matthew's cousin. They are close.) It's now an open secret among my group. 

I know that the best thing for me to do in this case would be to tell Abby how I feel. However, I don't want to do anything that will endanger our friendship, as that is something that I really value. Even if me and Abby don't become romantically entangled, she'd still be a close friend.

I have also been told that I should move on for now and wait, maybe Abby and Matthew's relationship won't work out. But I am conscious of the fact that Abby (and Matthew) will graduate in the spring and go to college. 

I hope I will stay in touch with her, but there is a time clock on this thing. More experienced people out there, what should I do?

Summarize the given text in a few sentences.
<bot>: The girl I like likes someone else, and I don't want to endanger my friendship with the my crush.  I'm asking for advice.