It’s perhaps the most cliché piece of advice about dating: The best way to get over someone is to get under someone new. But while casual sex may help some people move forward, it’s not a cure-all. And for some people, it only serves to prolong the emotional upheaval caused by the breakup.

The human body and mind go through a lot after the end of a long-term relationship. Older research shows that the pain of a broken heart can manifest physically—tightening in the chest, sore muscles, loss of appetite, even acne—and lead to depression-like symptoms and a crisis of self-confidence.

“I like to compare a breakup to a process of grief,” said Jessica Moloney, a licensed mental health counselor in New York. “In a sense we’ve lost something, whether it’s the relationship itself, the person or something that maybe we were holding onto that helped define who we were."

While a breakup may cause one person to feel sick at the thought of kissing someone that’s not their ex, someone else may