Having a curious, chaos loving, purple dragon flying around, constantly getting himself into trouble was a massive adjustment for Dr Nigel Channing.
He liked the dragon. Of course he did. In his own way.
And he promised Dreamfinder he would look after Figment.
It was an adjustment period for both of them.
Over time, Figment started to warm to Nigel. Stopped mentioning Dreamfinder so much, realising he was never coming back.
That was okay. Figment was reasonably happy.
He moved on. He had Nigel and the Imagination Institute now. He was the mascot of Epcot.
But he never forgot Dreamfinder.
A/N
Dreamfinder absolutely had a reason for giving up his baby. He wouldn't abandon Figment for no reason.