unhealthy spouse

Je
So, exactly 30 days after my husband and I married I found out I was diabetic.  I HAD NO IDEA!  Before I met him I could only eat what my shoe string buget could afford (you can imagine) 3.5 years later I am finally in pre-diabetic range. With the help of medicine, food education and exercise.  I get set back a lot because my husband eats whatever he wants all the time.  His bloodwork is nearly perfect. I can't get it through his head that this isn't going to last forever and all of his habits will catch up.  He is only supportive when he sees me having a major depression episode. The last time he joined a gym with me. It was really great. We were workout buddies and went 3 times a week for 1 month.  Then he quit going and made excuses.  Mind you we are paying monthly for mine and his black card membership for the next year.  Anyways. He just quit, he left me hanging and I am getting burnt out of going by myself.  We don't have any friends in the town we live since we move SO much all over the country so it makes it difficult to connect with others. Anyway how can I get his butt back in gear???