The couple reunited in the wake of Sheridan's split from fiance NIKLAS SODERBLOM last year (05). They had previously dated 14 years ago (92).
And Bolton insists this time things will be very different, after taking time out from his busy touring schedule to "work on my private life".
He told US TV interviewer DAPHNE BARAK, "I am very committed. It is a very special time in my life. I have a good feeling about the future. I have not been that happy for a long time.
"I have been staying at Nicollette's place in LA the last several days. We just needed this time together. We are both giving it a real try."
When asked about marriage aspirations Bolton added, "Look, if I did not feel this is the story, I would not have invested so much time and energy in it.
"Nicollette and I are very serious about each other."