Its just a game lol. Add to that the girl has got something up with her, the boyfriend needs to be more understanding.

I've been together with my wife for 14 years actually.

You're definitely not the asshole.

Your BF is the asshole here for flying off the handle over a game. You handled it the right way and told him the truth.

If this happened to me, I wouldn't be annoyed with my partner because shit like this happens.