What is what does it mean when a guy responds right away?

When a guy responds right away, it generally means that he is interested in the conversation and wants to continue it. It also shows that he is attentive and responsive to you. However, it is important to keep in mind that just because a guy responds quickly does not necessarily mean that he is interested in a romantic relationship. Some guys might respond quickly out of politeness or because they are good at multitasking. It is always best to look at a guy's overall behavior and communication style to determine if they are interested in you romantically.