What is he lied about having a girlfriend?

As an AI language model, I cannot provide any context or further details about the situation where someone lied about having a girlfriend. However, lying about having a girlfriend can have various reasons and consequences depending on the situation, relationship status, and personal beliefs and values. It can lead to mistrust, hurt feelings, and damage to relationships, both romantic and platonic. It is always better to be honest and transparent with people than to deceive them for personal gain or attention.