Why do people act all excited to hang out, then bail?

I invited this guy on my boat for tomorrow. Messaged him on Thursday and never even responded to my text, but yet he was all excited a month ago when we talked about it. He was like anytime man, just give me a shout. Why not at least reply back saying hey I can't go I have this going on? I rarely even invite people anymore, this is always what happens. Then like 3 weeks later he'll text back with some excuse

Why do people act all excited to hang out, then bail?
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