Virtual world dating !!

My boyfriend plays a Virtual Society type of game, IMVU. I recently found out that he is dating on this. He says that he keeps it separated from real life. I.E no texting, phone calls, video chat strictly roleplay. Should I be worried? He says that it can be sexual “cybering” sexting with graphics basically. I seen a photo of an avatar preforming oral on another and they looked like furry fox/humans!!! WHAT TYPE OF NEXT LEVEL SEXTING IS THIS? Would you consider this cheating??

Update: He says he doesn’t have any emotional attachment that its just something to do when i’m gone. But the other person involved does have feelings for him and has asked about a relationship. He insist I make one and entertain him if im so bothered. Even if I did, WHAT ABOUT WHEN IM GONE? IM PISSED as I can tell from yall comments people are really serious about this. What would you do?