My ex boyfriend and I got are both on lease he left the and is now threatening to kick me out ?

Generally speaking, no you cannot abandon a lease. That includes rights as well as obligations. The lease itself may speak to that in it's terms....

What are my rights if i recieve a confirmed default judgment against me?

Were you properly served with the suit or waive service?

If the car was totaled by the insurance company you would have received payment for it. Your friend may be accountable for the deductible or other...