Roleplay dating rules?

I have a girlfriend. She and I partake in a lot of roleplaying- not as ourselves, but as characters. Original characters, fancharacters, and characters from anime/manga/comics/etc. We have Tumblr and Facebook accounts for one or two of these characters we roleplay. Is it considered cheating in real life if we have /roleplay-only/ relationships with our friends on these roleplay accounts? [ie, we clarify that we are just friends in real life and the relationship is for roleplay and entertainment purposes only].