I notice these kinds of stories are usually better when the author has actually been in a relationship.
Anyway, honestly I think it would serve the story well if Ruka did a forever sleep. Not because I dislike her character, I like her a lot, but the MC needs to stop using her and there's no...
Even IF he finally uncovers the truth, this is the kind of scummy manga where he'll either forgive her or some other shit leading to her never being punished or feeling any sense of remorse, and being rewarded for being trash.