Nope. My partner spent the majority of his adult life before meeting me drunkenly fucking his way through half the female population (and probably some of the male population too) of our town, and probably more than that in his hometown before moving.
It pissed me off when I first learnt about it, but I'm no saint either. Sure I wasn't as bad, but everyone makes questionable decisions. Plus my annoyance mostly stemmed from a) the way I found about it, and b) The fact he didn't tell me himself.
Besides, I'd feel like a prick for making a big deal out of it. Since for him it was just sexuality-based confusion and trying to deny his guy-loving tendencies, which I can perfectly understand. His reasons are certainly better than mine, which amount to "because why the fuck not?"