People saying things they don’t mean

So many times I’ve bumped into someone I haven’t seen for a while or maybe someone even texted me after a while, and they say “we should meet up and do x”.

In 100% of cases they never get back in touch to do x. In 100% of the small proportion of cases where I’ve approached them to take them up on their offer to do x, some excuse is manufactured and x does not happen.

So WHY do people say this? 

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