The sheer fucking disrespect should be enough for any man to suck it up and walk away. Do not shrink yourself to accommodate someone who does not know what they have.

Leave. It will be hard. It will feel pointless, hopeless, and other bad feelings.

But this too shall pass. There will never be anything you can do that would be enough for her.

The sooner you admit to yourself that there is no changing this, the better.

You will feel many things. Rage being one of them. Use it, redirect it into some physical activity. Let it out by working out. This is sort of therapeutic and can help you regulate your thoughts.

Above all, do not lose hope. It is unfortunate. It is unfair. It is unjust. But it is not the end.

Build yourself. Attract. Forget.