Even if he wasn't cheating and was blackmailed, he did ask for a divorce, was neglecting MC to the point where he never learned of the accident leading to his memory loss. He let the public believe and MC believe he prefered the other dude. He let the public bully MC, and he never posted stuff about MC on his weibo. Even for their marriage anniversary, when MC posted a that picture with the cake, all the comments were saying it was just sad cause 2nd MC didn't post anything. Like it's been... how long now??? and he still didn't realize MC lost his memories?! Plus he wanted to get back together but if MC didn't say anything he would have been capable of just continuing like that, defending the other one online.
𝔹ℍ𝕆𝕌