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Sorry to say but he was probably talking to her while you were dating. People (not just guys) tend to jump from one person to another after a breakup because they don't like to be alone. It's stupid really because you're not taking the time to yourself and to heal from that breakup. People my age still do this and I tell them this all the time. You're just bringing the past into a new situation. Don't even worry about it focus on school. Good riddance he's with the ex.