There were a lot of things with one ex I had. He lied about having a job, even after he moved in with me. He would just leave the house and go somewhere for a few hours to say he was “at work.” I was in college full time and working part time, so I wasn’t home enough to catch him at this (though one of our roommates eventually did).
He apparently was able to pay for his part of the rent for a while by borrowing money from a whole lot of people on a rotating basis, but eventually that dried up.
He invented people as well. Especially people he “worked with.” And he always had new and more outlandish reasons for why you couldn’t meet them. It was surreal.
The craziest part was that after I kicked him out, he started telling his mom he had stomach cancer. I emailed her and told her it was definitely false, but she wanted to give him the benefit of the doubt. When she flew down for his surgery to help take care of him, he said he had the date wrong. He did that to her twice, then I think she cut contact.