Bendtner, quoted in The Guardian from an interview with Danish newspaper Berlingske, said he was "very disappointed" after he was told to remain at Arsenal, despite being on the verge of leaving.
"Everything was in place for me, there were three clubs that were just waiting for me to say 'yes please' to them," he said.
"I was very disappointed when he [Wenger] phoned because I was ready to move on. I didn't actually think that they wished to keep me.
"As I have been at the club since I was 16 I found it ridiculous that they placed me in the reserves and let me train on my own.
"But suddenly everything was like old times again. I was training with the first team, I was hanging out with the first team and I had a dietician again. From being completely out to being completely in again.
"I have to fight twice as hard during every game and also score to have a chance to start next time, which in itself is hard when I haven't hardly played in a year due to injury and have not had a pre-season together with the others on the team."
Bendtner went on to say he ignored abuse and criticism from Arsenal fans, who haven't exactly welcomed him back into the fold with open arms.
He said: "That's just what it is like to be a footballer. But I will remain strong because if I start to listen or believe in them I could quickly find myself in a black hole.
"At the moment I am an easy target for [some of the fans] because I want to leave the club and Arsenal don't want to keep me.
"And these haters - they always choose the same solution. But I think it is unfair to have a go at me when I had a transfer in place in the summer and Wenger told me to stay.
"I am training far more seriously [now] than I have ever done in Arsenal. I am in the process of building myself up so that I become this strong machine, this perfect product to sell. I want to start as strongly as possibly in my next club."