Guys who are reading comments after reading the chapter, don't forget, this manga has no Slice of Life tag, just (pure safe fluffy shoujo &) Romance so there shouldn't be logical critique for the characters' personal judgment & Earth-standardised modern thinking to apply here. This is Romance without too much heavy thinking involved in the world-building. Save yourself the headache & eat this work like the honey-sweet dessert that it is.
Anyway I can assume that the next (maybe the final plot) thing they'd do together is to get married, & another is that MC will also gain near-immortality age like her (future) husband? His bloodline was said to not live too long because of the curse but he's been delaying his death until 143 years old so far... he's a resilient guy, I can give him that.
& thanks for the spoilers below I'm just curious to read in advance without waiting for the updates lolol! Good spoilers.