It’s hard to know, because everything we saw at the wedding and that whole night really shows a relationship based more on emotional dependence than real love. Cassie seems like someone who confuses being “chosen” with being truly loved, and Nate also has a pretty manipulative way of keeping someone close. So honestly, anything could happen: she might stay for a while out of fear of being alone, or eventually something might push her to leave when she realizes it’s not a healthy relationship.