I have a problem where I either say nothing or get abrasive when I try to get a person to stop doing something that bothers me. This is why I'm asking here. My friend (Bob) had invited me and another person (Joe) to bowling. Bob chose a location close to his home. I was 15 minutes late, which I very much regret. Bob had messaged us he was there, but presumably got impatient and left. He did not tell us he had left but 2 hours latter messaged he had gone to do something else.
I found this really unpleasant wandering around looking for Bob (and Joe) wondering where everyone was. I have a separate question here asking how to address the situation with Joe.
How can I bring this up in a non-abrasive manor to let Bob know he should of at least said he was leaving so that we weren't looking and waiting for him? What comes to my mind is "please message us if you're leaving so we're not looking or waiting for you" but this may sound abrasive. Also I suspect he would retaliate about me being late. Awhile ago Bob said he's been seeing a doctor for depression, and I'm not sure how that may affect this situation.