Being the bigger person... for now

Just had a moment with my SO of two years that seriously got my blood boiling. He's playing Xbox with a friend when someone's gamer tag pops up "doeslayer" in a match. Dude confirms our humorous assumption that he means he's a lady killer. Well my SO said something to the affect that he's one in rl and I just nod with a smile because I'm in the middle of situating my kid to nurse. HE then proceeds to say "I mean obviously, you were pretty easy to put out when you did." His friend was like "dude, that's not cool" (could hear him through the headset) and my SO was just totally unaffected. I just sat here and decided to keep my mouth shut. Since I was so "easy" he's gonna be working his balls off to get laid for the next week, or more if I'm still upset. I wanted to tell him it wasn't so much me being "easy" but more the fact I would've felt bad for dropping him like a sack of taters (let's just say he knew how to work a camera for his online dating profile and chats) Rant over