Are males or females more likely to remain friendly with an ex?

Here and here it’s the guy that seems willing to stay friends with a former mate. In this case it’s the gal who doesn’t seem willing to cut her ties. My impression is that women are usually the ones asking how to get an ex to step out of their lives. But in my own life, I’ve had one former lover who kept calling after I got married, and I eventually had to forcefully convince her to leave us alone because it drove my wife crazy. Which do you think is more common, or does gender have nothing to do with it?