Once a cheater, always a cheater?
There’s been some debate on whether or not that sentiment is true or not.
Heck, there areentire Reddit threadsdedicated to finding out if serial cheaters are something we should be worried about.

Are cheaters always cheaters?
It looks like the answer depends on the situation you’re in.
It’s one of those things where there’s a kernel of truth to it."

“What this suggests is not only that there are serial cheaters,” wrote Dr. Lehmiller.
“But also serial victims when it comes to infidelity.”
Why do people cheat?

There isn’t one kind of cheater, and people don’t always cheat for the same reason.
She says that there are a number of factors that can all influence infidelity.
“Maybe they’re turned on by dishonesty,” Nelson toldINSIDER.
She mentions that these kinds of people might have an attachment disorder or might benarcissistic.