@TriceratopsX: Probably depends on the implementation. The way mine was going to work was the girl was one of your party members who the MC fell for through the story, but in the end she was working for the bad guy. The thing is, she was really in love with you, but she was also working for the bad guy because she thought his idea was better for the world. So you had to decide whether to kill her or forgive her and let her go. If anyone wants to use this too for their game go ahead, I don't have plans to make that story anymore (and even if I do later, it would look different than yours due to implementation.
One thing I do wish more games would do though is have more preexisting couples in the game. As it is, sometimes it feels like everyone is just waiting for you to come along. Where's the married couple that is out for adventure in their 20's?