Well, while being happy and enjoying life are most definitely top priority, there are still things that deserve a little worrying--bills and arguments with your spouse being two of them. I don't mean "worrying" in an unhealthy, obsessive way, but just enough concern to make sure both are taken care of properly.
When someone has a dramatic change for the better, like bypass surgery, it's really easy to forget about obligations and spend money on clothes or activies or experiences you couldn't before, which might be leaving her feeling a little panicky if finances are tight. She might feel you're not as worried about it as she is, and feel resentful.
My husband has been deployed for 16 months, and we have 10 more to go. And two young children. Our marriage would never have survived if we didn't have some super strong, ironclad communication. It sounds like there may be other stuff under the surface with your ladylove, so I'd advice sitting down with her and gently asking her how she feels. Don't get accusatory or defensive if she gets emotional or angry--just let her get it out and go from there. This is a big change, for you both. It'll require listening on both parts, and a lot of love.
Best of luck to you.
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Highest weight: 269. Surgery weight: 233. Goal weight: 144, and then we'll see..