Your question does not deserve an answer. In fact, just accept the fact and get over it. His answer will not justify it. You make a terrible boyfriend don't you? Your gf says she doesn't like something and you want to know why dont' you? I fucking hate that.
I'm the same way.
So whatever.
What's wrong with wondering why? It creates conversation and the sharing of ideas. I hate it when my girlfriend gets pissed off when I ask her why she doesn't like something.
My rant was directed at someone less rational.