You could have helped her as a friend, if your intentions were only to help. You didn't have to have a relationship with her to help her. Or was it that you wanted something instead of what you are giving?

Plus she has a family, and she has parents, she isn't alone as you are describing the whole situation. Why did you not let her go back to her parents, no one in this world will support her and love her more than them.

I think you have done a mistake from the very begining.

Plus instead of working on making her happy by giving her everything she wants, you could have worked on changing her; it would have helped her more now.

You messed it up.

Don't even dare thinking about a second girl now.