Seems like he still is sensible about it. Unlike Celestia, he probably only saw her as a knight who betrayed him. He understood that she was held hostage in a way. Considering the fact that he simply abandoned her and wished her for a good life this feels like a proper and good revenge. Abandoning her just like she did once.
Well I would say Celestia shouldn't have felt so much pain since she had already decided to not bond with him in his past life as lover but then again her lingering strong desire forced her to send last message đ¤ It's also possible she thought they might get together in this life since there is no connection between her sister and mc đ It's hard to understand her feelings honestly. They seem kind of similar to sword maiden's disciple who for some reason having strong feelings for Ryuk maintained her distance from him đ¤đ Thanks for the chapter đ