I am going through the same thing! My hubby says he will support me and "do" everything with me, but still he eats unhealthy and it's very hard to live with someone who doesn't share the same concerns you do.
All I can say is keep doing what your doing with your own health and keep "encouraging" him to join you. EX: if you go for a bike ride, ask him to go along. or if you make a healthy meal, offer him some.
I know from experience, unfortunately, the only way someone will change is if THEY want too! But you can just keep "encouraging" him, without nagging. Ask him once and if he says no, then just say okay and move on. Usually if they see you doing it and successful, they will eventually join. Or we can hope.

Good Luck, I know what your going through!
*Flady*