Some people are liars. And some want to invent a slight against themselves because they're actually the one who did something wrong and thus, feel guilty. Unfortunately, not enough to take ownership of it. So, because of the misunderstanding, they'll ghost the person. I agree with JD, be the bigger person and allow them a chance to explain. It's pretty easy for me to tell when someone is lying to my face. It's also up to you whether or not you accept their reasoning.
Yes, misunderstandings are the worst.