(rare) To show affection to; to have affection for.
1721, John Rushworth, Historical Collections Of Private Passages of State, etc.: 1618—1629, Volume 1, page 222,
And firſt, his Majeſty would have you to underſtand, That there was never any King more loving to his People, or better affectionated to the right uſe of Parliaments, than his Majeſty hath approved himſelf to be, […] .
1838 February 1, Charles Dickens, To Catherine Dickens, 2012, Jenny Hartley (edit), The Selected Letters of Charles Dickens, page 41,
Ever my dear Kate your affectionated husband.
Origin of Affectionate
Either from the adjective, or from affection + -ate (modelled on Middle French affectionner).