This drives my wife crazy. To her, laughing is what you do when something is funny. When she hears a laugh (even when she sees a smile), she assumes that I am "laughing at" something. If I am laughing because of how much I love her, she assumes I am "laughing at" her and is offended.
Is that about as good an example of human relationships as you can find? I laugh because I am happy and in love with her. My wife remains a beautiful woman and I am happy to be married ot her. I sometimes see her and just smile at the pleasure of her presence. She interprets this as being unloving. AARGH!
How often this is how our lives go. Everyone is doing something logical and reasonable and kind, but it is not perceived that way by everyone. I was raised in a happy family where smiling and laughing were how we related. She was raised in an unhappy family where negative attitudes and judgment were frequent. Her response to my laughing is as automatic as my laughing is. She is being reasonable, I am being reasonable.
Going forward in your life, be very careful about how you interpret what your husband does. Remember that his life was not like yours before you were married. No matter how long you have been married, he is not exactly like you. He may not mean what you think he means.
So, how am I supposed to deal with this? I don't know. I enjoy my life and I love my wife and would not know how to stop smiling and laughing. The trouble is that I really do love her and am happy to be with her.
Smiling and laughing is pretty much a natural response. :)