I understand that you want to talk in private to say hello, but I have a boyfriend and I don't want to make him regret by discussing with you in private, by which he did not know he had understood.
I understand you want to talk to greet privacy. But I have a boyfriend and I did not want him to talk to you in private with regret that he did not understand it.
I understand that you need to talk to greet personally. But I have a boyfriend and I don't want him to talk to you in private by sorry he doesn't understand.