Social Dilemma-Is It Okay To Cancel a Date/Appt With Just Two Hours Notice?

Okay, today's social dilemma came about because this has happened to me four times in the past week.  I've had dates, appointments, whatever you want to call them, with two different people and this has happened.  Let me get to it.   Over the course of the past week, with incidents at work and in my personal life, people have cancelled plans or appointments with two hours or less notice.   Now I understand that things come up and you have to cancel at the last minute, but over the past two weeks, the same person has done it three times.  We were set to have lunch together once, then we rescheduled the lunch for a different day, and then we were going to have dinner, and all three times the cancellation came with about an hour to an hour and a half notice.   The other one that happened was a work appointment that was cancelled with just a half hours notice, but I'm more forgiving of that because with work, you never know what's going to happen.   However to have the same person do it three times within two weeks has made me a little crazy.  For several reasons.  First, I'm always looking forward to a get together with this person. Secondly, I plan my day so that the plans fit in and I make time so that I won't have to be rushing off to do other things.  Now I admit, I've had to do this from time to time.  As I said, sometimes things come up at work that are unexpected, but to continually do it, I don't know what to do.   I love this person, he's a good friend, but do I stop making plans, do I confront him (though I don't think that will make a difference), or do I just keep trying?  Help me out.  What would you do in this situation?   


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