I learned this before: put it on the calendar. What I didn't know that is so obvious, is that spontaneous trips to the store can be a problem, especially if you don't pay attention to a weak ringing cell phone.
Here is what happened. We needed carpet shampoo, but my husband forgot he sent me out to get it. My husband kept calling my cell phone frantic to know where I was and I didn't pick up on the missed calls.When I came home from the store, he was mad because he didn't remember where I had gone--I should have told him—and I didn’t answer the cell phone. He was mad and I was hurt. Later he forgot that he had been angry, but I didn't.
However, I am over it now, and hopefully wiser.I need to constantly think about calling him to remind him where I am without sounding patronizing. Always use calendars and cell phones to back up verbal communication with someone who has short-term memory. And, a loud ring on a cell phone!