What is when a guy tells you he has a girlfriend?

When a guy tells you that he has a girlfriend, it means that he is already in a committed relationship with someone else. It is important to respect his relationship and not pursue him any further. Flirting or trying to get closer to him can cause unwanted tension between you, him, and his girlfriend. It is important to communicate your boundaries clearly and respectfully. It is possible to maintain a friendly relationship with him, but keep in mind that he is already taken, so it may not be appropriate to pursue anything beyond that.