Promised to message me, but didn't. Should I be mad in this case?

Recently came back with my ex boyfriend... and he was at a friend's gathering. I messaged him... he said he will text me when he comes home. Actually said "it depends when I will get home, but I will message you so you don't worry". And then nothing. I was waiting literally the entire night.

Promised to message me, but didn't. Should I be mad in this case?
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