My boyfriend has been messaging another girl on facebook what should I do?

nursegirl25
I've been dating this guy for over a year and i just recently found out he has been messaging another girl on facebook. I wasn't snooping. What happened was he was using my tablet and didn't log off or close his message page and when i clicked on the internet his message page popped up and i read it. Him and this girl has been sending dirty pictures to each other and talking back in forth. he has been telling her what he wants to do to her. she knows he has a girlfriend because she asked well what about your girlfriend? He says well it dont matter who im in a relationship with if we get the chance to finish what we started year's ago im taking the risk. I just dont know what to do. obviously im going to confront him. I think i should break up with him. He may have not have cheated on me physically but she clearly states he would if he got the chance. Any advice on what I should do. (sorry for the typos in just so mad and upset right now)
My boyfriend has been messaging another girl on facebook what should I do?
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