
I was referring to Mei's love for Satoshi (the older twin, still alive) that died, not in the literal sense. Mei's feelings for Satoshi is gone, thus the line 'my love for him died'. I hope I cleared it up! :)

I agree with you here as I come to interpret the story this way. This is also my favourite manga from Madarame sensei. After reading this manga, I ended up having a really serious thought of the whole manga then realised which "Sato" Mei's referred to on his POV.
I really love the part when suddenly Mei realised his own feeling and started to run to Misato who was patiently waiting for him, this is his sin for realised his feeling way to late and causing Misato's dreadful expression. That part is really impressive, full of emotion, powerful narration and beautiful art, perhaps It's just me, the scene made a great impact I felt like I was Mei and nervously run to Misato only to regrettably see result of what I've done to hurt him, I was overwhelmed with Character's emotion.
Mei knew it would take him a very long time to slowly make Misato believe in his love but he was certained that thing will work out (a positive metaphor showing leafless tree in snowy winter with a tiny little bud)
I'm sorry I write my though too long, I always come back to read the story and other people's opinion, the story is really beautiful. ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
Mei and Misato's story is probbly my fave among Madarame's work. And it took me a long time to realize that Mei was referring to his love for Satoshi (the old Sato) has died because he had 'embraced your love' (this line referring to Misato, the current Sato for Mei). He knew Misato was already in love with him and it took him a while to figure out that he was also in love with Misato. He was saying sorry for the fact the he realized too late, making Misato think that it was another one-sided love. I'm satisfying it ended happily, although vaguely. Madarame is truly a master in making the emotions of her characters stand out of the pages.