do the math

I was just thinking, isn't it funny?
How all of your exes happen to be crazy.
If you get the same end to every story, I might consider that maybe the problem is you.
We both loved someone, it was you.
One big disaster takes two.
Sooner or later, you'll see the one common denominator.
Do the math.
It's you, it's always been you.
And your daddy issues. That's a fact,
it's true. The constant is you, and that's math I can do.
When every girl says the same exact shit, and you call them crazy, I don't think that's it.
Do the math.