The girl have different expectations. Should split and let her date other people. Let her know look for him if she thinks he is better. If she finds someone worse than him then she will feel he is good.

It’s like you want to buy something and you think the price is expensive. But when you survey other sellers, they sell much more expensive. Then you will realize the first seller is selling cheap. Without surveying other sellers you will not know the first seller is cheap and doesn’t feel satisfied with the price.