I don’t think Belle really knows Rumpel at all either. All she knows about him is when they were alone and like oncescape said she knows nothing about the fact that he is actively ruining the lives of people around him for his own purposes still. And they aren’t even for anyone else they are all his own reasons. Bae did not want Rumpel to save him from the wars, he did not want him to kill the cart guy or the mute maid, and he wanted Rumpel to give up his magic and power and come through the vortex with him to our world. Rumpel didn’t do any of those things. He just does what he wants for his own purposes without any regard for anyone else including Bae. And so far we haven’t seen any change.
I actually think they heavily implied Stockholm syndrome in the show with Regina’s whole comment about not telling a woman to kiss a man who held her captive. And with the way Belle chipped the cup and thought Rumpel would freak out and then was happy when he didn’t scream at her which is pretty much what Stockholm syndrome is. It does seem like they are implying that she is his love though for the purposes if the show.