Episode 18 of "Alias"
s01e18 Masquerade

While on a case to track the activities of Khasinau, a.k.a. "The Man," Sydney runs into her ex-lover, Noah Hicks, who broke her heart and left without saying goodbye five years earlier. Meanwhile, Sydney tells Sloane that she wants to find her mother... Jack is ordered to see CIA psychiatrist Dr. Barnett to help him deal with his churning emotions after discovering that his wife may still be alive... and Will and Francie become suspicious of Sydney's activities after finding one of her airline ticket stubs.