He said: "He applied to the job, he made it clear he wanted to come to the club. I knew one day he would want to move on but to leave so quickly for a number two job at Gillingham, I can't understand that at all."
But Hendon insists he wants to put the whole incident behind him.
"What has happened at Dover has happened and that is in the past. I went about organising their pre-season and signed a couple of players," he said.
"I went away on holiday, came back, and in between I heard from Gillingham.
"I made an appointment with the chairman of Dover to tell him face-to-face rather than phoning him. I feel I went about things the right way in that regard."
Hendon says the appeal was simply that it was a league job and had no intention of letting Dover down.
"I want to be full time on the training ground every day and I'm looking forward to it." he said.
Dover and Gillingham are due to meet in a pre-season friendly but it is believed there is now some doubt about the fixture.
Parmenter told BBC Radio Kent: "I think we have to review that. Our fans will not be pleased with that situation and we do not want any problems at a pre-season friendly."
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