Sorry to see you here but regarding her family support I'm not surprised. They won't disown her as she is their kid, and out of the two of you, which one would they be more likely to believe: their flesh and blood or you?
Sorry to be so abrupt but you still have a lot of your life ahead of you, and maybe this situation is there to teach you something about yourself, and if you work on mending what was wrong, you'll bring a new you to your next relationship.
