Dave, I think this is the most important thing that has been said so far:
Sofia wrote:My husband can't bear for the children to ask for something--no matter how unnecessary it is--and not be able to give it to them. This has been the worst argument in our marriage--until he went into therapy about another issue, and this one came to the fore.
It points to how important therapy is for getting to the bottom of things. This seems like a no-brainer -- change your spending habits -- but I keep getting hints of other issues. A few examples:
- Your wife seems to have some boundary issues. Is she a partner in the business or not? Has she done work for you or not? My impression (and correct me if I'm wrong) is that she is involved because she is your wife, and because you work from home. Not that she has actually done work for you. If so, just because you work from home doesn't mean that it's not YOUR business or that you have to tell her about every last thing you do.
- Self-confidence issues, which you have already addressed, but specifically in this context. You say that you should tell her about purchases for two reasons, the second being, "It may make me think about whether or not there is a better alternative." Why don't you trust your judgement? Why do you need your wife to tell you whether there is a better alternative, especially if (and again, if -- not sure on this count) she is not actually a part of the business? If you were working for someone else, outside of the home, would you call your wife and consult her before every decision?
- Closely related to the above, control issues. You say you have always been like this -- I get the feeling that she expected to be able to change you, and is frustrated with the lack of result. I think that perhaps your "inability to change" is the fact that you are bristling at this attempt at control, at some level. Exercising autonomy where you can.
That last one is an example of a larger issue that, if resolved, can affect the more obvious issue -- if you are feeling overly controlled by her, and take steps to solve that problem, perhaps you will find it easier to keep your spending down.
Anyway, my point is less that any of the above are correct, as that there may well be more complicated issues going on and you would be well served to find that out, with the help of therapy/ counselling.