Oh well, cheap lesson to learn. Word of advice for me in the future, don't do anything.
I don't know. Maybe it is all the years of reading posts from nice-guy men that I can almost predict what he'll do. I felt you were going to give her the money when you first mentioned it. Even with advice, you will do what your nice-guy instincts dictate. And that's fine if that is what you really feel is right. It is your life to do as you please.
What I don't understand is why you did it and immediately say it's a cheap lesson learned.
It is only learned when you actually start handling it in a different manner.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!