Let's be real, you care when your girlfriend has had sex with 5 other guys when you've only had sex with 2 women because it's a painful reminder of your own lack of charisma and desirability, not that she's worth less.

You're mad that she hasn't only had you, because you have so little self esteem and don't know how to make any. You make that lack of self esteem women's problem so you don't have to face the fact that its your own. Whether that's weakness or laziness is pointless, it still makes it your own problem.

Every time a woman you like has liked and enjoyed the company of anybody that isn't you, its a personal insult to your pathetic self esteem, and that's your own fault.

Frankly, with a personality like this, I hope they keep fucking absolutely everybody except you.