Is is cheating if your spouse shows skypes with a naked girl and he jerks off

Last night my husband got a friend request on Facebook from a random girl. She asked to Skype her and he did. She started taking off her clothes and he pulled out his dick and started jacking off. It's the first time he has ever done this. She recorded it and blackmailed him into paying and voting for some stupid thing. She said if he didn't do she would share the video with me and our family. Is it cheating. Yes I am hurt but I don't want to leave him. I had s feeling something like this would happen, I was his first everything 

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