Is it because opposite attract??:)

Well, people can not decide directly who is wrong or who is right when they first met. There is nothing wrong about dating the wrong person. If that person is the wrong guy we can learn from those mistakes. Every mistake we did there must be one or two things that we can learn.

Depends on your definition of who is right and who is wrong. Why can't nice people date people who need help? We all have our own definition of what is good and what is bad. Good people can effect bad people, just like bad people can effect good people.