<human>: So I've known this girl since fifth grade, and I suddenly developed a crush on her a week before Christmas. I've liked her ever since, and today we had a concert together. 

During our dress rehearsal yesterday, I stared at her (she caught me a few times) and I also caught her staring at me a few times, which is the weird thing; I asked out her twin sister last February and we went out for about a week. I guess the fact that we were in seventh grade at the time kinda drew the fervor and excitement out of our relationship. 

I'm not really sure how to handle myself in this situation: I sat with her on the bus ride to the dress rehearsal yesterday morning (and afternoon, on the way home) and the conversation turned to dating at one point. 

Can someone please tell me how to conduct myself (respectfully) in this situation so that I have the highest chance of succeeding? Thanks. (note: Already asked same question on TRA subreddit)

Can you give me the gist of the text in a nutshell?
<bot>: This girl I've known since fifth grade (who i have a crush on) stared at me yesterday. what should i do?