Why do some guys say this, "Whatever happens, happens"?

I'm starting to notice a pattern with a few guys and when we first start talking it's a, "Let's be friends, get to know each other, lets kick it, but whatever happens happens".. I'm not looking to be friends with benefits and I don't plan to sleep with them. What's on their minds...
Why do some guys say this, "Whatever happens, happens"?
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