Why would someone piss you off for being insecure and overthinking things? That's not why he pissed me off, after all, either. KTBN.
I know right!
I summarize it as being insecure but if I had to go in detail about how his action made me angry it's probably because his insecurity hurt two other people who truly love him. Sorry I was confusing.
I mean how would you feel if a guy dump you because he thinks that you're relationship was a mistake? I'll be mad... not because he was insecure but he never once try to talk to Yuuki about it and then he just dumps him using pitiful excuses and trying to find a different route with someone who he didn't even love to protect himself.
He even mention it on this page
http://www.mangago.zone/read-manga/life_senjou_no_bokura/uu/life_senjou_no_bokura-chapter-4/15/
that the main reason he dump Yuuki was because he was afraid that Yuuki would leave him one day so he decided to dump him before getting dump. I just felt so bad for Yuuki.
Which is probably the biggest reason why I was so mad. It's because I really like Yuuki as a character (so I'm just biased) and it was painful to see that poor boy suffer for so many years. Unable to move on or find a new happiness with someone else while Akira could at least find some (tiny.) comfort from his new life and family (even tho it didn't last)
By chapter 4, I felt bad for his wife but at least she eventually find someone who really loves her. I was really happy that he grew some backbone to tell his wife that she's not the one he love. However, I was still mad at Akira but I was overjoy to see that he deserve what he was getting by hurting two wonderful people but I was happier by the fact that he realize his mistake and went to find him because even if what Akira did hurt Yuuki a lot, they did made a one heck of a cute couple.
By the end of there series, seeing them both so happy, I can't help but be happy for them as well. Akira learns his mistake and love Yuuki as much as he could for the rest of his life and Yuuki seem really happy as well.
Everything you've said are my thoughts and feelings exactly!
At first, the seme really pisses me off for being so insecure and overthinking everything. However as I read the last chapter, I find myself forgiving him.
After all, There's no such thing as a prefect relationship. There is always their ups and downs and lets consider this the biggest thing they face in their relationship. Plus the ending is so sweet. How can I not be happy for them?