I really felt like shaking this person like the xkcd comic guy shakes the screen... It's one thing to talk about something and just casually never following up

I really felt like shaking this person like the xkcd comic guy shakes the screen... It's one thing to talk about something and just casually never following up. That's bad enough already. But giving a precise date, and promising a follow-up, then never doing it... that's purely evil! Only valid excuse is a life-altering accident or something serious like that. Otherwise I'll hate you and will want to call you things ...shouting at my screen in my room's solitude.