How To Win A Girl Back After She Blocked You. 99.9% she won’t come back. A good relationship is built upon good communication.
Acting resentful is a good way of turning her off of you. Always know what she wants, always express.
And the second case, where you didn’t have any argument and she blocked you out of the blue, try to reach out to her as soon as possible because she wants that. As a matter of fact, women value someone who can make her laugh 10% more than men do.