No he didn't. Sondheim is gay, but struggled for quite a long time with emotional attachment. He had a few brief relationships throughout the 70s and 80s, but his major relationship was with a younger composer/producer named Peter Jones. Sondheim in fact dedicated the score of "Passion" to Jones. Some sources seem to indicate that they are no longer together, but Jones did serve as producer on the recent albums "Sondheim Sings", which collect a lot of his own personal demo recordings.
A good source for relationship information on Sondheim is Meryle Secrest's book "Sondheim: A Life". It's a bit tabloid-y at times, but it's the only book that really looks into his lovelife. Hope this helps.
No, he has never been married.
Sondheim on Sondheim was created in 2010.
Stephen Sondheim's birth name is Sondheim, Stephen Joshua.
Stephen Joshua Sondheim
The Sondheim Review was created in 1994.
Stephen Sondheim Theatre was created in 1918.
Erna Sondheim was born on 1904-02-17.
Side by Side by Sondheim was created in 1976.
Stephen Sondheim was born on March 22, 1930.
Stephen Sondheim is gay, therefore it is most likely he does not have a girlfriend.
No, Stephen Sondheim is homosexual.
Stephen Sondheim is still alive, and recently turned 79.