Zachary Quinto and Jonathan Groff are said to not be on speaking terms after they recently broke up.
The Star Trek Into Darkness actor and his partner dated for almost a year.
Apparently the pair are no longer on speaking terms after ending the relationship acrimoniously.
A source told PerezHilton.com it "not end well” between the men.
Zachary, 37, was recently seen walking their dogs with another man, according to the website.
The reason for the split remains unclear.
Zachary confirmed their romance during an interview published last September.
“One of the most defining conversations that I had with myself was that absolutely no good can come from me staying quiet about [my sexuality]. Literally, no good can come from it,” he told Out magazine. “But if I take the step to make the acknowledgment and be honest, so much good could potentially come from it.
“I’m incredibly happy, I’m incredibly lucky,” he added in regards to his relationship with Jonathan.
In March, engagement rumours began to swirl.
Apparently Zachary was thinking about popping the question to his love.
"It’s by far the happiest relationship he’s ever been in,” a source told America’s Star magazine. “They’ve been serious for a while now, but things have heated up since they started living together."
Jonathan meanwhile recently stopped work on his new film and jet from New York to Los Angeles to console his best friend and Glee co-star Lea Michele in the wake Cory Monteith’s death.
Lea was dating the actor at the time of his sudden passing on Saturday.
A coroner ruled this week Cory died from a lethal combination of heroin and alcohol.
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