Spearing has signed a four-year deal at Bolton after the Championship club agreed an undisclosed fee with Liverpool for the midfielder.
The 24-year-old impressed during a loan spell at Bolton last season, making 39 appearances for the Trotters and he made a big impression on Dougie Freedman.
Spearing, who came through the ranks at Liverpool, decided to leave Anfield after being informed by Brendan Rodgers his first-team chances would be limited this season.
"I will always be a Liverpool fan. It's been a massive part of my life and I thank everybody who helped make it happen for me," Spearing told Sky Sports News Radio.
"A lot of dreams came true, but now in football terms it was time for me to move on and get regular football.
"Regular football for me is the main thing for me now.
"Last year's loan was a massive part of my decision. I really enjoyed my time there, the lads, the backroom staff and everything about the club was something I really enjoyed and, as soon as I knew the manager was interested again, it was a good and easy decision to make.
"Last year was a massive time for me as I played nearly 40 times and it was something I wanted again.
"I sat down with Brendan [Rodgers] and we had a good chat and it came to a point that [playing regularly] wasn't going to happen at Liverpool, and we both ended it in a nice way."