[He's not sure he wants to continue, because there's a selfish part of him that just wants to shield his friend from all of this and focus on better things, but at the same time, he knows how much trouble that's gotten him into in the past and Erik definitely isn't Raven, so he doesn't.]

That her Magneto is a tyrant who rules through fear and intimidation. Mutants are still largely unknown, and he believes in mutant superiority rather than wiping out humanity entirely. [So he has that over Shaw, at least.] Shaw works for him, and Anya seemed surprised when I told her about our world's Shaw. I don't think they have much in common.

[And, selfishly, the part that bothers him the most:]

We don't know each other.