Honestly, this is one of the few instances that noble idiocy kind of fits. Aizawa needed to be there for his father and that he wouldn't have the time to balance taking care of his father, work, and taking care of Tsuji. Tsuji had been straight up until that point, their relationship was basically friends with benefits as if Tsuji was just trying on being gay. So Aizawa thought it would be best to let Tsuji have a chance at a normal life and a family.
He also failed to take Tsuji's opinion and thoughts on the matter into consideration. He was a coward on top of being a noble idiot. I don't mean that in an insulting way, rather, as a truthful statement. Aizawa was afraid to his core that Tsuji would be, as he had always been, just fine with ending things and moving on. The very fact that he did not do that cemented Aizawa's feelings for Tsuji and built his confidence in their relationship and future. Aizawa is one of the few cowardly, noble idiots that remains admirable to me. He took the long and bumpy route, but he got there in the end. Just like the rest of us cowardly, noble idiots have. LOL
Pisses me off. My boyfriend broke up with me because It was for 'my sake' and It would be hard for me to be with him. THE FUCK!!! I told him that I am aware of that and no matter how hard it will be I wanna be with him but he just broke up with me after hearing this. I used to think that this was selfless but now that thid happened to me I can't help but think that It's actually really selfish.Aizawa. I love you but your reason for breaking up is not right. -_-