SeanDiddyCombs’ complicated love life continues to be a thing of wonder. The rapper, still linked to singer Cassie, was at Brasserie Cognac, on West 55th Street, Thursday night with an attentive young blonde. A fellow diner said Diddy, who earlier this year was romantically linked to Cameron Diaz, seemed to be taking the female attention in stride. “She was totally into him, making a move on him, but he seemed rather nonchalant,” the witness said.