Possible scammer?

Had this happen to me. 503 area code as well and then another number. I unfortunately cashed the check but then thought better of it and contacted my bank. They investigated and found the check was fake. Now the guy is calling me a thief. I’m not responding to his texts. He has also deleted his offerup account and I’m not sure how to keep him from doing this to more people. I’ve definitely learned a big lesson and am lucky I figured it out before losing money.