your ip address will be logged at facebook so if he complains to them you could end up getting banned for life.so look out....
How do you get rid of fake profiles on Facebook?
How to Create a Fake Facebook?
Need a fake Facebook for revenge or just want to make one for fun? Well this article should help you figure out how.
Fake facebook account or not?
Fake Facebook help!?
If I'm correct, there are options for reporting a fake account? Otherwise alerting the authorities may be an option if it's serious.