But I appreciate that the author gave him a backstory. As BL fans we romanticize gay relationships but in real life it must be hard esp considering Japanese culture. The ex bf was pressured to take the path of what the society calls normal. He also thought about his mother's happiness and sacrificed his own. He is a jerk but relatable. He has a heartbreaking story of his own. This is the plot for some yaoi stories. Coming out is not a walk in the park. Choosing your own happiness is not as easy for some people. He sacrificed himself only to find his real love happy without him shortly after. He is frustrated with himself. He diasppointed himself. He did what he believed was right but is now regretting it.
Punch him! He doesn't have the balls to be himself and now that his exbf moved on, and then what? Like bro you need to stand up on your decisions. You have a wife!