Well, whatever route you take, good on you and good luck to you!
For what it’s worth, my wife and I spent a few years basically co-enabling. Like, we met, we both gained some weight, we got married, we gained more! Yay! :)
I think we both knew that this was not super acceptable, but it seemed like more fun to do the “let’s call Papa John’s and watch TV” thing than anything else. (Let’s face it, it IS more fun in the short term.)
I don’t want to speak for her per se, but I do think that one person just putting a stake in the ground and saying, “I’m doing this, you don’t have to, but I gotta do it,” was necessary to get started. I wonder if she had done it first whether I would’ve gotten on board (probably not). It just took a major moment to actually change up all the stuff in my life. And it really is all of it; every time I see food or drink, I actually go through a conscious thought process in my head: “Is this a good decision?” I’m not always making the right calls, but I’m workin’ on it.