It's interesting to look at expectation and hope from the perspective of the MLCer and the LBS.
One of the reasons that the MLCer is going through the process they are going through is because of unmet, unrealistic expectations that they have set. As your definition states, "rigid clinging to unreal belief", this is what has been created in an illusionary world of the MLCer. They have obviously set these unrealistic expectations many years ago in their lives and as time has passed, they find that other people, relationships, and finally themselves, can't meet those expectations, which is why they have a negative outlook on the world, are depressed and constantly blame others for their issues. After all of those years of unmet expectations, they have a meltdown, which is the MLC, because they finally have an epiphany, that life is passing them by and they are running out of time, yet, their life is meaningless because their expectations have never been met by ANYONE.
I look at hope from the perspective of the LBSer, because given the state of mind the MLCer is in, they have no hope. Hope is the domain that most LBSer's live in, not just for themselves, but for their MLCer as well. They pin their hopes on the MLCer coming out of the process, they pin their hopes on the relationship with the MLCer being resurrected and rebuilt to a better state that before, they pin their hopes on themselves, that they have the strength to make it through this devastating process that they had no part in.
So, as you can see, two different perspectives from the proverbial same coin. It is all in how you look at the situation you are in. The MLCer sees nothing but doom and gloom and the LBSer is trying to stay positive in order to see what could be. They both are on separate paths and at some point, the MLCer is the one who either "sees" the light and pulls the train back onto the tracks, that the LBSer is on or they don't and continue to spiral further down the mountain. It really boils down to choice.