You're not showing "humanity" if you stick with someone in a new relationship upon discovering a mental disorder. It's a personal choice; someone making a different choice doesn't lack humanity.

And once children are involved, it is not just about you. Plus, you're bringing that person not only into your life but into your family.

Here is something: what if your feelings change because of this? Should you stay, just for the sake of demonstrating your humanity to the world?

Oh, right, it's okay to break up because of changing feelings, because those are human.