My boyfriend has been talking to another woman online?

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I found out that my boyfriend of 10 months has been talking to another woman online. Apparently they met in a random chat-room like chatroulette. They added each other on facebook (a month ago) and have been talking everyday since then. They don't really flirt, except he said she looked pretty once about her profile pic. She lives like 6 hours away so I don't think they are looking to hookup. They talk about random crap. I found out about it going through his facebook account, and I made him fess up. He says they're just friends but they msg each other more than he msg's me. What should I do?