I received a summons that a lawsuit will be filed against me and I have to respond to the complaint.

I am not licensed in your state, so this is for informational purposes only. First, do not wait to Answer the complaint, you have specific time to do this in and you do not want to default. Go to the Courthouse and file an Answer right away. I am unsure from your question if the Loan was taken personally, or for the business that filed bankruptcy? If it is a personal loan, and it was not discharged in the bankruptcy proceedings, you may be liable for the personal loan or personal guarantee. You should consult with the bankruptcy trustee named on the bankruptcy, as well as with your own attorney, so that you can be aware of all your rights. Good luck to you in this matter. Again, do not delay in answering the papers to avoid a default.