I guess I made an issue of this, because I feel like if I can't trust her on something so simple, how can I trust her with more important stuff? For me, trust is a big issue in the M. Mostly, I don't sense that my W is trustworthy.
TH, I can understand how little things like this can become big issues, but I think that this sounds more like one of you needing to be correct than a trust thing. You should invest in a digital thermostat and this particular argument would go away. You could also save some money in the long run because they are programmable...
