Lets talk about being honest with your significant other about your struggles.
I was oddly open, but at the same time, barely involved my ex-husband.
In terms of being oddly open, when I had my first consult and made the decision that I was really going to do something about my weight, I was very clear about how much I weighed, why I wanted the surgery, and how important it was for me that he supported me in the way I needed to be supported. This meant not being offended when I turn down food, eating at places with healthier options for me, and mostly important not questioning the decision to have surgery.
But, he didn't come to appointments. He never came to a support group. He didn't know much about the process. I didn't involve him because it was something I preferred to do on my own. He didn't push and just let me do my thing. I was very appreciative of that at the time.
I think the best advice I can give is to not be afraid to ask for (and expect) the type of support you want to receive - whatever that looks like for you.
For more info on my journey & goals, visit my blog at http://flirtybythirty.wordpress.com