Kelli Garner and Johnny Galecki
Alex J. Berliner / Abimages
08/27/2014 AT 12:45 PM EDT
Johnny Galecki and Kelli Garner have called it quits after more than two years together, a source confirms to PEOPLE.
The breakup of The Big Bang Theory
star and former Pan Am
actress, who first stepped out together publicly in early 2012, comes just months after a romantic vacation in Mexico. The duo also attended the nuptials
of Galecki's ex and Big Bang
costar Kaley Cuoco
, who married tennis player Ryan Sweeting in Santa Susana, California, on New Year's Eve.
Reps for Galecki, 39, and Garner, 30, have not commented on the split.
The news also comes on the heels of a very big month for the actor, who signed a new, three-year deal
that will pay him – along with Cuoco and Emmy winner Jim Parsons
– the same $1 million-per-episode salary given to the cast of Friends
in its final season.
Reporting by JULIE JORDAN