He WAS in love but didn't want anything further with the brother bc in the end to him his love for his entire family, the concept of family, was stronger than his feelings for his older brother (me thinks). So he never thought about doing anything lover-like with him (even tho they do all that...). It's weird but he also said he loves his SIL so I guess that's what he means?
So he still loves him but now his romantic feelings will go toward his nephew instead, and it looks like older brother is ready to also just let him go (?). That's what I got, still confused tho

Jesus I had to read the summary like three times and my curiosity got the best of me. TBH the relationship between the brothers would’ve been sweet even if they weren’t basically kissing like a couple every few chapters. EDIT: WHAT THE FUCK WAS CHAPTER 4-5???
It genuinely had me laughing in disbelief that the bottom kept saying he wasn’t “in love” with his brother, but that BROTHER COMPLEX IS SO STRONG.