I read lots of threads on here of people being let down not turning up to social events etc - it's definitely happened to me.
But - here's a situation where my night school class were going out for a meal and I didn't turn up or bother to reply to a text saying 'are you coming?' when a woman I was friendly with texted me to ask on the day. This, despite earlier that day replying to a text from her concerning 'bringing a bottle' that indicated I was very likely to attend.
Just to mention, this was 15 years ago so not current .
I'm thoroughly ashamed of myself and have no excuses. I totally own it.