@Blue_Phenox
Hard disagree. We can all empathize with people who are struggling and trying to come to terms with themselves and have problems in their relationship (this manga being one such extreme example). And I also don't feel as strongly about people who cheat in an abusive relationship (since sometimes the cycle of abuse means you can't escape easily).
But why on earth are we only giving empathy to the cheater and not the cheatee? Just because the other person in the relationship isn't going through similar horrible things in his/her life, he/she doesn't deserve the basic respect and sympathy of someone going through his/her own problems? No. If you cheat, even if you have your own circumstances, and you don't have the basic human decency to cut things off with your current partner or the capability of staying away from relationships in the first place knowing how broken you are - then you are 100% in the wrong for making someone else suffer through this just because you were "suffering".
I've been cheated on before. I know how it can break someone. And I didn't know about how the stuff I did wasn't fulfilling my partner's needs, but instead of telling me, she hid it and decided to seek someone else instead - instead of being the adult and trying to talk it through. Even I had the common courtesy to start telling my partner about my doubts and fears when I was in another relationship where I didn't feel things were working out. BECAUSE I RESPECTED MY PARTNER AS ANOTHER HUMAN BEING. It's not just about me.
I completely understand that gay people also have struggles - some probably even beyond what I could imagine. But it doesn't justify cheating or hurting someone.