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you cant do that because youre a total idiot
aurevoir (if youre saying bye)
par(if youre saying by like if youre writing a story)
check youre answer
if your dating youre not very close to him/her if youre in a realtionship than youre very close to him /her
No, of course not. Unless there is some specific legal bar to communications, you can talk to anyone you choose.