Robert Sean Leonard at the 2007 Tony Awards held at Radio City Music Hall. New York City, USA - 10.06.07

The actor insists both should be commended for their professionalism - because he wouldn't be able to deal with such a public split.

He says, "They're quite civil. They're either very professional or very mature.

"If I broke up with someone on the set, there would be pans flying.

"They'll hate me for saying this, but they're both incredibly sweet."

Morrison accepted Spencer's proposal in December 2006, but called off their engagement in August (07).

Source: WENN