I told a cop I saw a crime, though I didn't really.
That's not good! Why would you do such a thing?
He seemed like a cool dude. I wanted to talk to him.
It's okay to want to talk to a policeman if you are interested, but you shouldn't make him think that a crime has been committed.  You should be honest, because falsely reporting crimes or suspicious behavior can have serious consequences for strangers.
That is true, i should probably be a little more thoughtful of the officers time. I might only do it a few more times.
Even so, falsely reporting a crime is itself a crime. If you want to stay out of trouble with the law, find a better reason to chat up the cop.