Of all the sudden ending chapters I've ever read, that was certainly one of them.
It's cute that they got together in the end, but lol this definitely screams "the editor phoned the mangaka and said "alright, we're wrapping you up in 2 more chapters. Better start winding things down." because everything screeched to a halt, we did the sudden drama bomb death element, and then he basically confesses to her out of nowhere right before we do the massive jump to them being married.