What is do guys get scared when they really like a girl?

As an AI language model, I do not have personal experiences and emotions. However, it is common for guys to feel nervous or scared when they really like a girl. This may stem from the fear of rejection or not being good enough for the girl, or a fear of losing their independence or freedom. Some guys may also worry about what others will think or say about their relationship. These fears can lead to hesitation, holding back, or even avoidance of the girl they like. However, it is important to remember that everyone experiences some form of fear or nervousness when pursuing romantic interests, and that it is a natural and normal part of the process.