You're not over-reacting, sue. I felt pretty much the same way.
Being fat doesn't mean being unattractive. It may not be what you like to see, but beauty - real beauty - comes from inside. What you love about your husband, the essence of him, is more than what the scales say ... or at least it should be. Thank God my dh isn't so shallow as to think that my weight changes the person that I am so much that it would entitle him to have an affair and entitle him to blame me for it.
I am lucky in that I know my dh loves me very much. He loves my mind, he loves my soul, he loves my sense of humour, he loves my intelligence, he loves my childishness, he loves the things that make me me. Maybe I'm lucky that he can see that I am not defined purely by my weight, but I would like to think that most people are capable of seeing past their partner's size and seeing the person underneath. What would you think about us if you met us? You must be aware that there are some of us on this thread who are as heavy as your dh - when you talk about him you are talking about us.
I am angry that you have said those things on this thread. A thread full of women who are large, a thread full of people who are just like your dh, a thread full of people who are desperate for others to judge them on who they are and not what they look like or what size they are. I feel judged, and I don't like that on this thread.
Am going to cool off now. Sorry if I've been harsh but I am really, really angry.