Why did he ask me if I was going and then he didn’t show up?

Anonymous
Ex boyfriend who is related to my best friend (cousins) asked me if I was going to a family party over the weekend and I replied that I was and he said that he might go and that it should be fun
He ended up never coming

Now we haven’t dated in 3 years and this is the first time he’s asked if I’m going to a family party and I been going to them for years

Now my question is.. why would he even ask in the first place
Why did he ask me if I was going and then he didn’t show up?
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