what are the rules?

Can I still
tell you I miss you?
call u at 3 am?
can i still ask your advice
say I am sad it ended
say that you were the nicest guy
can I curse the day you said
should we?
can I still say sorry
for wiping my eyes that day
and saying
yes we shud, yes we shud.
What exactly are the rules
of break up?