smudgey SG this is their jia1 shi4. don't meddle. IMO, your friend B is a coward! this is his responsibility... please do not interfere
ghirlhie SG ask B first if he’s so sure abut his feelings. and if he is, tell him that it would be better if he’s the one to tell C, afterall, he’s the boyfriend. he should be straightforward if he doesn’t want to hurt the girl anymore.
