I agree with a few posts above. One should not need to go to a grocery store to fetch one item. I almost never do it and I live alone now. For a family, even more so. Part of good menu planning and in general running a household well is doing what is called batch processing (I am not an engineer and inaluna, being an engineer, might explain with more specificity what the term means - I learned about it from a very good audiobook about algorithms in our daily lives). So when you do batch processing, everything is more efficient and you can stay focused on a task. You do grocery shopping for a week or at least for one meal at a time, everything required for that meal. You pay your bills regularly, many at once. Say, I pay mine twice a month when I receive my paycheck. I have bills I pay in the beginning of the month and bills I pay mid-month. Driving to a store for bread alone wastes time, gas, and focus. Your husband was justified in his reluctance to be so wasteful, but it appears that he would have still gone had it been for you. But you said it wasn't for you. And yes, how you said was a remark both depressing and snarky. No wonder he was not inspired to bring the bread.

So in his particular instance, your husband's behavior does not illustrate the point you are trying to make. You wanted to make a negative comment on his behavior, but in reality he was willing to comply with an unreasonable demand to drive to a grocery store for a last minute one item purchase for YOUR sake. He wanted to be helpful.

Maybe this all just shows that you have had enough and everything he does, just the way he breathes air, would cause you to be irritated. And if that is the case, maybe the situation is beyond repair and it is time to call it quits. But I would be curious to learn why, then, of that myriad irritating moments you are surrounded with day in and day out you chose, for your post, an example that doesn't illustrate your point, an example in which the husband was willing to do something for your sake even though that something demonstrated an inefficient method of running a household. Surely he must have done worse things, no? So what was special about this? Or was it just the most recent irritant that preceded your decision to finally make a post?

Do I understand you correctly that you want to lose weight in anticipation of going back on the dating market soon, meaning if you actually decide to divorce? And if so, are you avoiding bread yourself to lose weight? If that is the case, it is a reasonable step to eschew simple carbohydrates, but then why whom did you intend the bread for? For your son? For your husbandm? That wasn't clear to me from the OP.

From the general principle of effective people management, you want to inspire people do be their best at work. Not precisely, but this principle applies somewhat to running a household with the help of family members. Not only did you not inspire your husband to bring the bread, but you disincentivized him by showing that you yourself weren't in the least inspired by the prospect of eating that bread. So it is no surprise that he did not want to bother. If you want to test him, select a dish you yourself like eating, give him the whole shopping list for that dish, and tell him that you look forward to sharing your favorite dish with him but need his help with bringing home the ingredients. Watch his reaction and compare to that in the bread incident. Maybe you will learn something helpful to inform your future big decisions.