Meeting the Gamer Friend

Okay so ladies, does your boyfriend play online games? Does he text and talk to a female that he meet via online game? Has he mentioned about wanting to meet her? Well my man has a female friend he plays online games with and he told her that we would be in Atlanta in march and she mentioned how she's moving there and they should meet. Yet he did NOT discuss this with me until after the fact. My question is why? How would you feel? How do you tell him that you feel uncomfortable without coming across as controlling or psycho? They've been talking for a few years (way before me) but my thing is why would you want to meet someone from online when you're in a relationship? And this is the same girl he ran to to talk about our issues after and agruement.