Made fake Facebook account and FIR filed in cyber cell. what can I do

my bf's sister wants to get married to her second cousin which is not allowed in our community.we are due to fix things soon but this action of hers might deter my parents n bring bad name to us.she eloped once n blackmailed to return only when her marriage gets fixd.I got very angry & made a fake facebook acc. and messaged her describing the way her decision will impact everyone,we had a heated argument.i deleted that acc to stop aggravating the matter. she filed an FIR with cyber cell.Now i want to know if they would be able to trace me bcz acc is deleted?what should be my course of action?