I think maybe it was his lack of emotion during his grieving process that maybe tricked him to think that maybe he didn't actually love her, but toward the end I think he realized that he did. Or did he actually not really love her? What do ya'll think?
I honestly think that he did love her. He just didn't know how he felt until he was destroying their home. That's what brought back memories of the things they had done together.
He didn't know how to let go of something he didn't realize he had. His catharsis is the epitome of grief and what brings him (and the viewer) full circle. He didn't allow himself to feel the pain because he was afraid of what it meant. It meant the end of what he knew and that his love was real.
I didn't like the movie much because it goes too far but do find the disconnect very believable because I experienced it. When I was 17 my father died and I felt guilty I didn't cry at the funeral. The part when he's mugging in the mirror trying to force grieve was exactly what I felt and did. It did catch up to me as in the film but again it went too far but I guess a good cry after a couple of months would have been boring. I did smoke my first cigarette on that day and still smoke wish I hadn't started.