MMORPG's... my IRL friend wants me to add him, but I...?

I'm playing an MMORPG, and I like to role play. I met an old friend who plays the same game, and he gave me his character name to add him.

Is it silly of me to tell him I stopped playing? I would just be paranoid about my identity coming out. Or him using my real name in chat or something.
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