Cyclonus is afraid of losing Galvatron, either to deactivation or to his own mental disintegration; he's afraid, sometimes, that the latter's already happened.

He loves Galvatron. Obviously enough. XD

He lost--his Armada. The certainty of purpose he had, serving Galvatron in the early days. The opportunity to carry Galvatron around inside of him (because Galvatron's too determined to always be unconfined and in control).