First, respond in the legal way and on time with, for example a motion or an answer with affirmative defenses. Failure to do so could result in a...

Generally you can sue defendants in the state they live in, as well as other possibilities.

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If you do not have it in writing, be very cautious. You should make sure they are not going to file a default.

Yes and you likely want to do so. Also look into Requests to Produce and Requests For Admissions.

They can sue you were the debt arose, where you live now or the state indicated as jurisdiction in the agreement.

You will have to communicate with Aaron’s to make arrangements. Make sure you get their agreement in writing.

You can counter claim against your boyfriend. Other options are to negotiate to pay less or and payment plan. Bankruptcy is also possible.

You would need to satisfy off the debt. Possibly negotiate a settlement. Check the DMV website to determine their requirements.

You can be sued by whoever owns the debt.