Why are they fighting over a man

They were all around 13 at the time. Settle your jimmies and relax. Maybe he overplayed his hand. I don't see him with either now.

I was referring to the fact that as a rule, regardless of age, this is this response.

I'm pretty sure you can blame it on estrogen and the fact that homogametic or XX females always look at other homogametic or XX females as the enemy.
And I'm still trying to figure out what Dwayne Johnson has to do with this.

Females are xx

Relationships aren’t all about looks y’know

Yes, what's inside counts and all that deep stuff.