If the person calls again, repeat. This kind of answer respects the other person s feelings and closes the door to any argument. Only someone totally clueless won t get the hint. Don t blab about the person. You d probably feel hurt and disappointed.
Nobody enjoys a break-up, no matter how old they are.
Ending a relationship can be messy and painful. And do it privately. Don t accuse or blame. You want the break-up to seem like it was fated to happen and not the result of anyone s behavior. Now you have to put the pieces back together, but the pieces aren t going back the same way they did before.