This older man in his sixtys was cheating on me, so I broke up with him and after a week he texts me twice and then called leaving a desperate message for me to call him back. I made a doctors appointment to get checked out, he wants to go with me, I just don't want to be bothered with him at all. What should I do when he's mad that I don't return his call or text?

Tell him straight out that you don't want to see him anymore. If he doesn't understand, tell him again.