reason to my love is liable Decius has said that he doesn't want to go to the Senate-house with the message that Caesar is hiding at home because his wife is having bad dreams. Reason would tell Decius that Caesar wouldn't like to hear this opinion, but Decius so loves Caesar and so wants to see him crowned king, that "reason to my love is liable"; in other words, he has said what Caesar might not like to hear because he loves Caesar so much. Of course, Decius is lying through his teeth.