Cleo's boyfriend sent her an e-mail message at work with details about a highly personal matter. The message was sent to Cleo's company e-mail address. Her boyfriend requested that she respond as soon as possible. Why should Cleo call her boyfriend to discuss the matter over the phone instead of responding in an e-mail message?

The phone is a better tool for discussing the personal matter because Cleo's company has access to her e-mail and the company e-mail address is not supposed to be used this way.

Personal matters should not be mixed with work. If they are using company email there are high chances that someone from the work can access her emails and read everything. The work is not a good place for such matters, and Cleo should use her personal phone number to solve the matters with her boyfriend.