I everyday go for lunch with my friend. He says that a guy follows me everyday when we go for lunch. He even tells me that I see him too. But I don't remember any person whom I met the last day. I think this is a serious issue. My friend doesn't trust me. May be, I see that guy everyday but I don't remember. He says that I'm not loyal to him. I want to prove my friend that I'm not wrong. Please help me. Am I undergoing short term memory loss or anything else?