Relationships are more "loaded" with negative personal consequences for women. Less so than in the past, but it's there.

There's often a negative interpretation of a woman having more relationships or ending one that isn't really a factor with men. IMO, this creates a bias to justify ending a relationship for cause.

With a man, there's no threshold where your next girlfriend will lead to you being categorized negatively. If anything, you get more respect in some circles.