#xmfc

It’s clearly indicating that Charles is trying to find a fellow mutant to connect with romantically. Raven’s off the table, since she’s his sister. But he wants to find and build a romantic bond with someone who has a mutation, who is different like he is, and he’s resigned to searching for things like heterochromia and auburn hair because he doesn’t know for sure if there really are more full mutants out there with actual superpowers.

Literally the only reason he starts flirting with Moira is that she has auburn hair, i.e. a mutation.

Then he meets Erik and all the flirtation with random heterochromia women and with auburn-haired Moira stops. Because Erik is what he’s been looking for.

I’M SCREAMINGGGG