<human>: Give me the gist of the text in a nutshell

I have a long-time female friend (19) with whom I speak and chat a lot. We are good friends and talk all the time about anything non-sexual, even though she very often hugs me and touches me all the time when she's around me. She's insanely beautiful, with light blonde hair and gorgeous blue eyes, and she is also incredibly smart.

My gut feeling says that she fancies me quite a bit, but I haven't approached her as she has a boyfriend (20) since about April/May. He is also a long-time friend of mine, but not one of the closest.

However, over the last month or so it seems like they have been losing some interest in eachother. They are no longer on eachother's top 3 on Snapchat, he didn't wish her a happy b-day on FB a couple of days ago and to my knowledge they haven't seen eachother in about a month.

It appears to me that it's him that has lost interest and is perpetrating the apparent breakup that seems imminent. Don't know what she's feeling but I think she still has feelings for him.

Should I try asking her questions about her relationship, and more importantly, if and when they break up, how long should I wait before I approach her?
<bot>: She is my long-time good friend who I'm quite interested in and they are apparently breaking up soon. How and when should I approach her?