Has he cheated or is it just another form of porn?

My boyfriend and I have been in a long distance relationship for two years now. Earlier today I was snooping, yes I know it's wrong judge me all you like, I was in his emails and discovered that a few months ago he had got online to some random woman, I think it's a porn star but I'm not entirely sure, and did some live cam stuff, from the sound of the message I believe they were both topless but I don't know about anything else. I don't think this is the first time he has done it but from the looks of his emails he hasn't done it since. At that time we hadn't seen each other for about two months, I don't know if I should consider this as cheating or just another form of porn. I don't really want to confront him about it because then he'll know I've been snooping. It's all just a bit of a mess and I'm very confused on what to do, it hurts me to think that he can do this and then act as if nothing has happened. He just didn't seem like that type of guy. I love him very much and I'm seeing him next week to celebrate his 21st birthday. What do I do? I can't leave him, he means to much to me but I don't know if I can go on knowing he's done this.

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