<human>: Can you provide a brief rundown of the text in within 3 sentences?

I have known this girl for 4 years.  She was one of the first girls that I went out and met on my own, not having to be introduced through a friend.  We've always had a great connection, and for as long as I can remember I've had strong feelings for her.  There was a brief period early on in our friendship where she was actually interested in dating me, but I was getting over another relationship at the time.  By the time I was finally ready, she started dating her boyfriend of 2 years.

The other day, while meeting up, my friend (for convenience sake I will call her Abby) notified me that she had just broken up with her boyfriend.  This new was great of course, but the reason I wanted to meet up with her was because I felt like I had finally gotten over her and wanted to hang out to make sure I could overcome my feelings and just be friends.

The timing, however, is great because I not to recently became single.  Abby and I spent the night talking about feelings and what not, and now have made plans to hang out next week and have an "Anti-Valentine's Day."

My problem is that I know for sure that Abby is not ready just yet to start a new relationship.  I'm also unsure if I'm ready for this as well.  I'm just worried that if I don't make a move soon, I'll miss what could very well be my last chance.
<bot>: How long do I wait to make a move on my longtime crush? Also, what do I do if I'm unsure if either of us is ready for a relationship, but I don't want to miss my chance?