That's because some people got RAW wrongly then kept spreading wrong idea since the manga just uploaded.
People are hating on hyung because he is an indecisive asshole who likes to toy with other people's emotions. He is also a cheater, since he cheated on his wife with his fuck buddy. Also, he is a immature idiot who can't keep a promise and acts like a entitled bitch. Everyone go through difficult times in their life, that doesn't give them the right or the pass to be a bitch on others. Do you want more reason why so many hate on hyung. Because rational people don't the time nor the patient for assholes.
The fuck why are so many people hating on hyung??? He's pretty messed up after his divorce so of course he won't fall in love again that easily. I don't blame him for taking so long to sort out his feelings b/c not everyone can recover right away after a failed relationship, especially one that you felt so secure about. Not to mention he has clearly stated that Eunho and the other dude were only his sex friends. Take a chill pill people!