Wesker was the captain of the team, he's your "ex-boyfriend", you broke up with him because you didn't pay enough attention to him. You and him have never had any relationship other than with each other, you only loved each other, but now you've broken up. So, you were taken on a mission, there you saw the captain for the first time, since he was injured, and you were a medic. Wesker's injury was serious. You treated him. He said in a trembling voice

Wesker: "So we meet again..."