I was think, what you guys think makes Erik split up his friendship with Charles again?, he was with him recruting Jean, which is when school reopen, after get closed in 1965-1966, due to Vietnam War.
I think it's because Charles didn't wanted Jean to have full access of her powers/Phoenix. So he leaves X-Mansion.
My Erik/Magneto's Original Timeline is like this:
1977 - Erik is released from prison, when the state learns that he is innocent of didn’t kill JFK. Charles and Erik makes amends, returning their friendship. Charles, with Hank and Erik, built the Cerebro of original trilogy.
1978 - Xavier reopen school. Charles and Erik visit Grey's residence. Jean Grey joins school. Xavier and Erik have a discussion about Jean's powers. Erik decides to leave, to not get involved in school, but not leaving on bad terms with Charles, Erik lives as normal civilian. Same year, Mystique escapes Trask Industries custody, Charles and Raven sibling relationship ended.
1980s-1990s - Anti-Mutant movement increse, this cause Erik to returning to be Magneto, then he reforms Brotherhood of Mutants, with Mystique, Sabretooth and Toad. With this, Xavier restart The X-Men, with Scott, Jean, Storm, and Beast, to faced then. Erik acting behind the scenes, instead in field.
Prior-X1 - Robert Kelly have a idea to proposed ''The Mutant Registration Act''.
2002 or 2003 - X1 events.
2003 - X2: X-Men United events.
2006 - X-Men: The Last Stand events.
2015 - The Wolverine post-credits scene.
2023 - X-Men Days of Future Past's dark future.
What do you guys think?