"You do know that Ken and Rei were going out the whole length of the SP, right?"
I was under the assuption that they agreed to be just friends for the time being after the debacle at the wedding. I thought that they didn't become boyfriend/girlfriend because of the feelings of Rei parents and that Ken was still scared of their teacher.
And just so you know, I wasn't again them being together the entire show. I was hoping that Ken would get one of those flashbacks right so he can get together with Rei. But after the finale, I thought it would be much better if it were a "they love each other but fate kept them apart." thing.