You should tell him. Sometimes men don't have much of a clue.
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I just worry for him on the day he makes you decaf!
he knows... before we had a coffee maker (way back when) he would actually go to the 7-11 at the corner to get me a coffee... and he made sure to put just the right amount of sugar and cream--making sure it was the color of his forearm--because that's how we knew it would be just right... and he doesn't even like coffee... btw--we don't buy decaf... i mean, what's the point in decaf?