I fell in luv with this girl... then found out she's married :-( (Newly married girls - please advice)?

I say, let her be. She is married... She may have a weak spot in her marriage at the moment, and that is why she is doing- what she is doing. If that is the case, step back and let her figure it out. If things fail in her marriage, then you can always be that support and shoulder to carry her through. And then let the sparks fly... but, that would be ugly to get into a triangle...