The rumor caught fire after the designer didn't mention his longtime lover in his acceptance speech at the CFDA Awards on Monday night.
Just a week before Marc and Lorenzo were playing the part of a couple in lurve at the amfAR gala, but things went terribly wrong following the event.
The couple left the amfAR event to celebrate Wilhelmina Models CEO Sean Patterson's birthday at The Park restaurant. Patterson then invited the group to continue the pAArty at his SoHo apartment, but Marc declined leaving Lorenzo to go at it alone.
Once at the apartment, Martone made out with a man that came with his girlfriend!
The two were caught by the mystery man's girlfriend, which led to a nasty argument with lots of yelling. It's uncertain how word got back to Marc, but if yelling was involved we're sure it wasn't hard.
Within the past couple of months these two have had more than their fair share of problems. Maybe it's time to call it quits and go their separate ways, if this is true.
[Image via WENN.]