Truth! Women move right along because they are not as emotionally deep as they'd like us to believe AND getting new dick is easy.
Most average or reasonably attractive women don't have to be alone or deal with loneliness if they don't want too.
Thus, making them more lonely...because they can't deal with being by themselves...becoming serial relationshipists, out of one, into another, without any transition or breather. And continually making the same mistakes in the process. Until they have a long string of dudes, and "wonder what's wrong with me".
Men fall quicker than women, but women are quick to severe ties easier. Many are more emotionally invested into the relationship---it's after you fuck up X amount of times, they will cut that shit off. And we don't know, she may have given dude several chances to buck up, after a certain amount, it's "I'm through with your shit.".