Nicollette Sheridan and Michael Bolton
09/23/2008 AT 08:00 AM EDT
Life is just a little bit lonely for Michael Bolton – and not just because of his recent split
from fiancée Nicollette Sheridan.
The newly single singer – who insists he and the Desperate Housewives
star "remain friends" – is also adjusting to daily life without his three adult daughters, who have all moved out of the family home in Westport, Conn.
"Empty nest syndrome, that's what I have," Bolton told PEOPLE Sunday at the 16th Annual Michael Bolton Charities for Women and Children At Risk benefit concert at the Rich Forum in Stamford, Conn.
Now that daughters Isa, Holly and Taryn (from his 15-year marriage to Maureen McGuire) have grown up, Bolton has put his waterfront, 2.7-acre estate on the market for $11 million.
Is he feeling sad about selling the Tuscan-style, six-bedroom home he's lived in since 1991? "Well, yes and no," says Bolton, 55. "The reality is I'm spending so much time in Los Angeles and traveling six or seven months a year and working on my record. My daughters are grown up. When I come home and open the door, I hear an echo: 'Hello, hello, hello.' "
Since his split with Sheridan was announced last month, Bolton is focusing on his friends and family – and
on his charity work.
"I'm doing what I consider really, really important work," he said of the domestic violence charity he founded in 1993. (For more information, see MichaelBoltonCharities.com
.) "You are supposed to come into your home and feel safe. Violence against women is unacceptable."