My wife thought I was absolutely crazy to be considering such an off-the-wall idiotic idea as WLS!! She wouldn't go with me to my informational seminar, and it was months into the process before I could get her to go with me to meet the surgeon. That helped somewhat and she grudgingly gave her okay (not that I'd asked her for it!

) I was glad to have her on board because I needed a ride home from the hospital!!
She watched me closely and about six months post-op expressed her concern that I was losing way too much way too fast and I was looking sickly to her. I reassured her and took no action on her concerns. My body was in charge and I was gonna go where it took me.
Fifteen months after my surgery, she had RNY herself, and has lost about 100 pounds in the 16 months since then. We think she may be stopped at goal, but it could just be another long stall. In any case, she doesn't have far to go if she's not there yet.
You had time to come to this idea slowly and make peace with it. When you spring it on someone who knows nothing about it, it's a shock, and if ignorance of the facts informs their thought processes, it's an uphill process for you.
You aren't doing this for him. You are doing it for you, so you can spend years more enjoying a full and satisfying life with him. It's normal for the spouse to have concerns that you'll move on, as others have already expressed. Some extra loving and reassurance will help ease the emotions and calm fears.
Good luck!!
CT