05/24/2013 AT 11:45 AM EDT
is opening up about her divorce in the June issue of More magazine
"We both wanted it to last forever, and it's a sad thing that it wasn't able to go the course," the Smash
actress says of her 10-year marriage
to writer Daniel Zelman.
"Part of me will always contend with guilt that I wasn't able to give my son the fantasy that my parents were able to give me."
After working on opposite coasts for three years, Messing, 44, says she and Zelman tried to make it work to no avail – but are now content on focusing on their 9-year-old son, Roman.
"We really tried," she says. "We made sacrifices and compromises, and in the end we both realized that we like the day-to-day domestic life."
She adds, "Now we are co-parenting
beautifully … We had Thanksgiving together. In my mind, we will be a nuclear family forever.
The couple filed for divorce in June 2012