In the final scene of X-Men: Dark Phoenix we see Magneto sit down for a conversation with Xavier. He begins by asking Xavier how retirement is treating him and later says the following:
MAGNETO: A long time ago, you saved my life. Then you offered me a home. I'd like to do the same for you.
This line confuses me a bit. Based on Magneto's comment earlier, Xavier is apparently retired from actively teaching at the mutant school. Retired does not mean homeless. Why would Xavier be in need of a new home? In what way is Magneto "offering a home" to Xavier?