Caught My Husband's Secret Video Chatting Session

I stumbled upon my husband's laptop open late one night and saw a secret video chat window. It was someone he called 'Honey,' sending flirtatious messages and suggestive images. I didn't want to know, but I couldn't stop watching for a moment. His eyes were different then, filled with excitement and desire, something I haven't seen in years of marriage. He's never hidden it from me before, always been open about our sex life. But this felt...different. Cheating? Could he be cheating on me virtually? Or is there some secret world I've never known about? I don't know what to think or do now.