Can we be friends

C: BF and me broke up but want to remain friends. Sister said “that doesn’t work”
T: I don’t want to never see him again
F: Pain
A: Cry, worry it will be weird when we date other people
R: Resist my sisters advice

Any advice on this? I want to be friends with him with an occasional coffee meet up or something, nothing too intense but I do want to keep in touch.