Ings says he was happy at the club but not as happy as he could have been.
“I felt I needed to go to a club where I could really prove myself to be somebody else's Mo Salah, be somebody else's Firmino, someone else's Henderson or Milner," he told The Times.
“I wanted to go somewhere I could be an important player. Be the player the whole city looks up to.
“The lads at Liverpool all wanted me to stay, but understood. We used to play cards on the way to away games and it was a different feeling for me because I wouldn't be starting.
“I would cover that up, and I hid that, because I didn't want to bring any negativity to the group. But it didn't stop me going home and just sitting in the house with my dogs and being upset. That happened for a long time.
“Although I was happy around the lads and everyone at the club, on a much deeper level I know I wasn't as happy as I can be."