As you know, I've been the one here with the most hard-line, "affair-busting" "any-contact-is-very-high-risk" stance in the past, but I've come around to the conclusion that it's far more important for you to get your emotions under control. Throw in the "meds" angle and I think this is a very wise plan.
Plus, men are horn-dogs, yes, but we're also VERY career-focused especially when you factor in the inherent competitiveness that comes with a new promotion. I suspect that he's FAR more focused on his new job responsibilities than he is on HER right now.