The best thing you could do is ignore him. Ignore the flirty texts and keep things strictly business if you need to talk to him at all. He needs to believe that you've moved on from his drama.
Even when he tries to contact you for logistical things, do not respond back to him right away. He's going to accuse you of ignoring him, but stay on track.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.