Maybe he thinks this is normal? Some guys get so comfortable in a relationship, they don't think they necessarily have to "do" anything and they assume the love is still there without having to say it. I know some guys like this even in a boyfriend & girlfriend relationship. I also know some old couples who have been married for 25+ years that do that.
So just make sure he's actually aware there is a problem before you file a divorce.
Make it very clear how you're feeling - tell him everything you just told us, gauge his reaction, and depending on if he makes an effort to show you he loves you - then that should be your answer.