SHAFAQNA – The Grand Ayatollah Sistani answered questions about keeping ties with others.
Question: If someone does not want to talk to me, or continue to have ties with me; in that case is it still Wajib to keep ties or not? Can I leave that person to himself/herself?
The Grand Ayatollah Sistani: You do not cut, and it is enough whenever you see (them) say Salaam (greet them), and how are you; and if they get ill and need help, help them.
Source: PERSIAN SHAFAQNA