My sister wants to leave her boyfriend but she doesn't know how to tell him. What should she do?

She should talk to him honestly and calmly in a private place. She should be clear, kind and firm about her decision.

Перевод: Ей следует честно и спокойно поговорить с ним наедине. Ей нужно ясно, доброжелательно и твёрдо сообщить о своём решении.