I'm not someone who often tells readers to "Caution on the side of paranoid" but I feel in this particular case, the facts (you've shared) lead me to think something's fishy up in here.
It sounds like he's laying the groundwork for some sort of shift; as if he's easing you into the concept that these days women find him terribly attractive and therefore he may have been or soon will be innocently dragged into some sort of situation or event.
It's sort of like a dude with ripped abs randomly announcing "it's frickin hot as hell in here" as a prelude to "the necessity" he take his shirt off. Or, a woman on a date, mentioning at the very start that she may be getting a call from her friend who desperately needs her immediate help with X (this of course means, "If you suck, I have an exit strategy in place. Don't blame me if this date is 13 minutes, Dude.")
What's more, if this new announcement from your man is coinciding with a new job or some specific new female relationship in his life - you have grounds to feel suspicious. For three years he didn't weigh in on who's been flirting with him. Why now? Unless your man got drastically hotter in the last few weeks - jaw reconstruction, calf implants - I'd say something is up.
Feel free to follow up with our readers and me as to what's transpired. As GI Joe and others on this panel have said before: Knowing is half the battle.