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"After you break up with somebody, your brain isn't used to being alone," Forshee said.
"When you're with somebody your brain releases feel-good chemicals like dopamine.
Which explains why, a few days or weeks after breaking up with someone, you might find yourself missing a previous ex from several relationships ago.
"We're all vulnerable to falling into dating our exes again because we know there's comfort there," Forshee said.
"You have to force yourself to gain new experiences that are really uncomfortable," Forshee said.
But Forshee said it's possible to re-train your brain out of the habit of serial relationships.
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