Can my contractor put a lien on my house after walking out in Texas?

I know I'm going to be scolded for not having a signed contract so please I need to move on from where I am. I hired this guy to do the repairs on my home from hurricane Ike. The terms were the norm; 1/3 down for materials and such, 1/3 halfway, 1/3 upon completion. Right off I gave him 5k and he started with the roof. He found more problems as he got further and we agreed that I would provide the materials since it was only a few sheets of decking. Then he began asking for draws to pay his labor, or more materials, etc. which I did for him. When he did my siding the material cost was twice what the original bid was and I had no choice but to buy the materials since he once again claimed to have no funds. I learned later that he over-lapped the siding way too much which is why my cost went up. To keep this as short as possible let me just say that I finally got to the point of not having enough $ from my insurance co. at the rate he was asking so the last time he asked for a draw I refused until we could sit down and go over all the numbers. He started on several of the projects but didn't finish not one. He left and never came back. I had to hire someone else to finish and took lots of pics when the new contractor discovered his errors. It appears as if he claimed to know how to do all the things he quoted me on when in reality he did not. He made such a mess of my home it was barely liveable. He had no respect for what little was not damaged and carelessly did things like walking on my new wood floor with mortar on his feet, he broke several things, on and on and on. I had to purchase most of his equipment bc he said that he had gotten out of the business and was planning on starting up again so the stuff I bought could come out of his pay. When he left without finishing, I kept the equipment bc he cost me way more than I should have paid. Now, he sent me a text and is threatening to put a lien on my house. How will I know if he does this? How can I protect myself from him doing this? This has been going on for so long, its still not completely done and the money is gone. I just want to move on but I am concerned since I have never been through anything like this. Please help