What is boyfriend lied about hanging out with a girl?

As an AI language model, I cannot provide personal opinions or share personal anecdotes. However, generally speaking, if a boyfriend has lied about hanging out with a girl, it can be considered an act of dishonesty and a breach of trust in the relationship. The circumstances surrounding the situation would determine the severity of the issue and whether it is something that can be resolved through communication and trust-building or if it indicates a deeper issue in the relationship. Open and honest communication is key in resolving any issues in a relationship.