YDI with a caveat. If you asked her out and she said "no sorry not interested" only now she suddenly is okay that sucks. If you never made a move though or let her know that you like her then that's all on you. Hell if that's the case more like F her life she finally got the courage up to let the guy she know that she likes him and he's moved on. Also if you did never make a move don't tell her now that you used to have a thing for her because that's mean.

If you leave your chick for her, she won’t want you anymore.

sounds like a homewrecker given the timing and all

Threesome!

dont fall for it save yourself lol

Typical case of I don’t want you but no one else can have you...