i actually like iseon BUT just because you're aro, doesn't mean you should keep it from your lover of many years??? you should communicate so that if they ever feel insecure or doubtful, they know how you feel about them and that you are serious about them. yoomin would've felt off about his love in the future regardless....
another thing, he should've never spoken on the phone about her that way. does his friend even know he's aro? what if some other person he knows overheard? it'll make yoomin seem pitiful....he should've just said that he doesn't feel love towards people like others do, but he can feel attached, secure, and comfortable and that is the most important to him - and that his actions will speak for himself. yoomin would've probably understood better like yea this man does not love like i do but he cares about me - then she would've communicated with him and would've made a decision: do i want my love to be reciprocated/am i ok with his love language or should i end this relationship? he had so many chances....
and also, he should've still been the one to communicate. you were going to marry her!!!! anyways, he's not the one for her. yoomin has found someone that will reciprocate like her (probably still affected by trauma and will love too much esp when feeling lonely) but hyundos love language is more like hers and they're perfect. sorry iseon, you really had your chance and i hope u can communicate with ur future partner so they can understand you from the get go.....damn he really was a good bf besides all this....sucks
i pity him so much.....bcs damn one misunderstanding changed everything....but yoomin deserved this honesty from the beginning....and as much as u showed that u loved her in ur own way....yoomin wants someone who can physically feel love....and she deserves it....sorry iseon