How to keep calm and carry on.

We all have those exes we’re cool with never talking to again. Like, ever. But then there are the ones who we'd be open to going there with again…if the situation was right.

Of course, getting back together with an ex isn’t easy. You broke up for a reason—even if the details are hazy right now—and there’s a chance you could both fall back into old habits that just didn’t work when you were a couple.

That said, it’s not uncommon to make up with a former flame and try to move on. “We are wired for attachment and also for new experiences,” says licensed marriage and family therapist David Klow, owner of Skylight Counseling Center in Chicago. “When we can have a bit of both by getting back together with a former lover, many of us jump at the opportunity.”

It’s possible to have more success with round two, he says—you just need to approach it the right way. Thinking of going there again with your ex? Click through for some helpful ground rules to follow.