Maybe he's one of those spouses that the idea of their spouse actually losing weight makes them insecure.
I've read that this happens for some couples. The spouse in question is afraid that if their spouse loses weight, it will change the dynamic of their marriage. If the spouse having WLS actually loses weight this time, they will gain confidence and will be noticed by others of the opposite sex, or even leave the marriage. So they're using the excuse that it's the easy way out in order to deflect from their own insecurities in the hopes it guilts you into not having the surgery. Again, I've never heard of this happening with anyone I've known, just read about it.
But in the end you have to do what's best for you and your health, so maybe you just need to explain this to him that you're worried about where your health will be in 5, 10, 20 years if you don't get healthier now.
Best wishes to you!
