updated 03/22/2013 AT 2:35 PM ET
•originally published 03/24/2013 AT 4:15 PM ET
The It’s Always Sunny in Philadelphia actor, 67, and the former Cheers star, 64, wed in 1982 and have three grown children together.
“They love each other,” a friend of the couple tells PEOPLE of the pair, who have been quietly working on their relationship. “Always have and always will.”