The first time my husband told me he loved me, he said it seriously.
For a very long time after that, he always said it in a funny voice, or an exaggerated tone - the same way he tries to crack jokes when we're having a heavy conversation.
For the past couple of years it's been a pretty standard, casual, "Love you," and, "Love you, too."
He is in Las Vegas for the weekend for a friend's bachelor party. I got a text last night that reads, "I love you so much it hurts." I wish he would SAY that to me.