A north pole faces a south pole. The magnets pull together.

A north pole faces a south pole: the magnets pull together.

A north pole faces a north pole. The magnets push apart.

A north pole faces a north pole: the magnets push apart.

A south pole faces a south pole. The magnets push apart.

A south pole faces a south pole: the magnets push apart.

A south pole faces a north pole. The magnets pull together.

A south pole faces a north pole: the magnets pull together.

If you turn one magnet around, a different pole faces the other magnet.

That is why pull changes to push.