Most Helpful Girl
No one can really answer these questions. Some people just heal faster than others.
Her cutting you off could mean 2 things - she's trying to get you off her mind completely OR you're already off her mind and she wants nothing to do with her. It's more likely to be the first one. I think we're all guilty of flirting too much after a break up, in the hopes that we can fill the void that's been left behind with many people, even though it never really feels the same. It's the same reason people go for rebound relationships, it's to get over their ex and not feel lonely after a break-up.
It's just that different people have different coping mechanisms.