Do it like the cold war, with MAD (mutually assured destruction). You both have an atomic bomb, but it's better that neither use it, because if anyone does, you both do, and then it's all bad for everyone. Just use it to keep him in check, but don't play your only card. Fuck, that's like 3 analogies in one: war, chess, and poker. lol. Also, I'd say he's gotta choose one woman, cuz if it happens again shit will hit the fan. That's not cool, ya know?