It's complicated. [ But that isn't an excuse not to share her story with him. After everything he's done for her, she has no reason not to share it. ]

Baseline humans have never really accepted mutants. At first, we were oddities, a small percentage of the population that hopefully wouldn't grow. But it did, and there were more mutants every year. Eventually, the governments of the world decided we were a problem that needed to be dealt with.