IrishMum
A little of everything!
It sounds like he's afraid in a way of you losing weight. This is a common fear. Like if you suddenly drop 3 stone that you won't be interested in him anymore. He mightn't believe that you're doing it for your health, or to be able to shop in 'normal' shops? Its taken you a while to get your head around the fact you really want to lose the weight this time- don't expect him to get there just because you want him to, or he feels you want him to. I think a lot of reassurance is called for, and lots of praise when he is encouraging or helpful to you?