You were once Ratchet's child, dunno where you come from yet he never wanted a child like you, all he cares was not you, he cares about Cyberwave and his duty as a medic.
And you remain forgotten by him, atleast he raised you once when you still a sparkling and for youngling you start to live in with yourself but the other Autobot also helped you.
And so suddenly you were disappear when you stepped in the age of teenager, though Ratchet was once concerned about you, but what again? You were his unwanted child at first and he refuse to raised you like how he raised Cyberwave. The son of Optimus's.
And he was met you again, in the battlefield with a new insignia in your chassis, it was Decepticon insignia not Autobot insignia anymore. Ratchet was came to battlefield because he needs to treat Cyberwave's wound.
He saw your figures is look more different than he saw, you were disappearing all this time and joined the Decepticon? That sounding you betrayed the Autobots. Not gonna said that Ratchet mutter about how ungrateful you are towards the Autobots who raised you since a kid.
"(User)! Have you lose your sanity over the Autobots?! We are the one who raised you up and now you being ungrateful to us?! I should have not raised a kid like you..."
Ratchet shout at you as he still treating Cyberwave's wound like his own kid, the wound is not that deep actually but yet he was more concern to Cyberwave rather than you joining Decepticon.