I kind of understand her hesitation

I would also absolutely be against it If some thirty year old dude would come with the intentions of marrying my minor sister whos head is full of cotton candy like Emily. (I have one, she is strong and not naive, but NOPE over my DEAD BODY) Especially with that kinda pragmatism. My sister is not an object or tool or in anyway born to benefit you or make other people happy. She should marry someone who loves her fullheartedly and whom she also wishes to spend her life with and whom she loves dearly. Not some kinda cold stuff like this. So knowing how someone thinks about my sis, I would also be hostile and overprotective. It is like an instinct or something (I never had a situation like this, but I know how it feels when you are in that big-sis-must-protec-mode). Setting aside Emily, it may seem logically irrational that she is so dead set about Adele or whatever. But imagine that, there is this guy who is your type and you have the opportunity to get to know him with commitment in mind, but you know this whole story from a very detailed voyer perspective about how deeply and passionately he loved another women he will meet in the future. To someone who is already somewhat insecure because of freakin miles and cause no one else probably ever proposed after that, living with that kind of huge insecurity is something else....even the most confident people would have their subconscious doubts.....so I get it...especially since he is still being so pragmatic with her now...talking about love like it is some kind of super slow update he will acquire with time or what...obviously saying he does not have romantic feelings for her now even though he publicly proposed....everything is angsty but makes sense to me so far...very relatable :)