Does this count as cheating?

I've been friends with this guy for about 2 years now. at the start, he was single, and we got romantically involved but never officially. ie. sexting, skyping with not much on, pics etc. now he has a gf, but we're still doing that sort of thing... it's a mutual thing. sometimes he initiates, sometimes i do. and his gf doesn't know. but he seems plenty happy with doing that. we both really enjoy it and he's still in a strong relationship with his gf... but... does this count as cheating?

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