For example, if a guy continues to contact or text you, react with, "I'm not at all interested in you. Please refrain from contacting me." If he persists, say it again before ending the conversation. It may help to write down what you want to say before reaching out. That way, if he doesn't take the hint, you have something clear to say instead of wasting time trying to explain yourself. Use common sense and understand that maybe he's just not your type. There are lots of other guys out there who would love to be contacted by you. You just have to find one who isn't interested in playing games. If you really want to end it with someone, send them a simple message saying so. Don't expect a response though; they might not even see it! But, if they do, things could get real quiet between you two. Finally, if he keeps coming back after you've told him to stop, then you might need to block his number or delete his account.