Keep your distance and never let your guard down.

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MY gf had moved into an apartment building and we ran into the landlord dude.

She introduced me and the guy never made eye contact and gave me the wimpiest handshake on the planet.

Later on I told her that I didn't trust him at all and there was something strange about him. She poo-poohed me and a few months later she told me that she was stopped by two detectives in the parking lot asking about him-
turns out he was sleeping with a teen that lived one of the units. Sometimes you intuition is way better than you think.

So, be careful and never leave anything to chance.