You wont be the first or the last. I understand dude being upset and what not but to take that out on the next man is ridiculous. What many of your Coli Brethren fail to tell you is that ALL women, no matter old or young will have cheated once in their life. You were just on the right end of it and eventually some day you will be on the receiving end of it as well.
From what OP described, she wanted to get caught as she left all of those texts there and he obviously sensed something was up because he went looking in the phone. My advice to many of young men including my son will be to NEVER invest that much emotion into something that will cause your freedoms and health. Imagine that the overwhelming majority of posters in here are in agreeance that the man will come to shoot you rather than taking his wife to counseling or court.
My advice to you is to tell dude. Answer the phone. You dont want that to come into your place of business. Tell him what happened. Its life. He will live.