Anytime someone threatens to sue you, things change. You need to be very careful with how you talk to this "friend" going forward. Save all old emails and cor

Anytime someone threatens to sue you, things change. You need to be very careful with how you talk to this "friend" going forward. Save all old emails and correspondence, and avoid talking to them until you really understand the details of the contract that you agreed to 6 months ago. You need your own lawyer. Find a good one (ask around other freelancers in your area) and go over the contract with them and explain the situation. The first meeting with a lawyer should be free.