"It wasn't anything dramatic and they were on good terms – it just came to a natural end," their source said. "They will remain friends and they see each other, but they are not together. It was very amiable."
J.Lo and the actor started dating around 2011 and kept their on-again-off-again relationship fairly out of the public eye. TMZ reports that they split after Smart went to a UFC match with friends instead of a charity event in the Hamptons with Lopez.