La Toya Jackson -- Engagement Off

La Toya Jackson was out to dinner with the man we thought was her fiancé, but it turns out ... they called off their engagement and didn't tell anyone.

They seemed serious as they left Mastro's Thursday night.

La Toya chimed in from the passenger seat that Jeffre Phillips was a truth-teller. When our photog scoffed, Jeffre reiterated.