I am sure you will not read my comment but here we go as someone that reads the story without taking sides.
I am not sure how far long you are in the story so there might be aome spoilers below.
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So lets start with the case that eunhyunk tried to contact suae before he left, but as we know the line never connected it looked like suae had blocked / ghosted him. After that we all know as readers that he had his hands full with his mother being hospitalised (thats pretty much its a legit reason to drift away from someone that ghosts you). After the time skip there is still the misunderstanding of suae thinking that she got ghosted while eunhyuk believing he got ghosted too.
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Now dowhwa, hmmm i wouldnt call him a good friend or bf at that, he also "ghosted" her for 10 years, and i dont know the way he "pushes" himself into suaes space i wouldnt say its the healthiest way for a relationship to start.
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Both mls have some discussion to do with suae so that the story can move on.
Ok see regarding the ghosting part the ml is actually her boyfriend yahhh and the other while maybe her friend it was also someone she rejected if moving away was the way he can move on his entitled to that because again they are not together and she had a boyfriend at that time which was hurting the sml so he chose to leave which is valid maybe it hurted the fl a bit but you cannot compare the two of them because the standing they have on the fl's life is significantly different.
Yea i get that, but in this case we have already a view why 1 ml stoped contacting her. ( from his pov he was blocked for some reason) romantic or not it looked like suae made up her mind. In 2ml case sure he was a friend and needed time but whole 10 years? Now that he became famous he come back i dont know, it just doesnt come as honest. (If he had been in contact with suae between these years it would have been another story)

The amount of eunyouk defender is wild to me honestly as someone who used to love him I can proudly admit that even if he had a reason to leave the fl it doesn't justify shit... he still left, still abandoned her and made her question her self esteem his trauma and issues doesn't give him the right to inflict it to others he had so many chances of making the right choice and just communicate and tell her but no... he chose to stay silent and let the misunderstanding grow more and more..
Genuinely to anyone here who are in the same situation as sooae please pick a man like dohwa not eunyouk because I can guarantee you if he left you once something got hard his going to do it again