What would it mean if my girlfriend says that being friends after a break up is' not 'going to?

If your saying that she said your not going to be friends after a break-up then it means leave her alone. She probably took it pretty hard even if it was her that broke it off. Hope I helped.

it just means that she couldn't be friends after you break up cause it would hurt to much so see you after a breakup and she could not deal with it