I really have no idea what the end of this story is going to like. Double suicide seems possible, but then so does them staying in this codependent equilibrium that they've found.
Their relationship has gotten more wholesome at surface level, but I'm not sure if there's a way for it to be a genuinely healthy one without them splitting up for a good while.
Although, I don't really think the intent is to depict a healthy relationship at any point, so really it's a question of how gnarly the end is going to be.
Compelling stuff!