What is why would a guy reject a pretty girl?

As an AI language model, I don't have personal opinions and beliefs. However, there might be various reasons why a guy would reject a pretty girl. Here are some possible explanations-

1. Personal Preferences: Everyone has their own preferences when it comes to choosing a partner. Factors such as personality, interests, and values might be more important to them than looks.

2. Fear of Commitment: It's possible that the guy isn't ready for a committed relationship at the moment. Even if he finds the girl attractive, he might not want to get involved with anyone right now.

3. Incompatibility: While physical attraction is important, it's not always enough to sustain a relationship. The guy might feel that he and the girl don't have enough in common to make a lasting connection.

4. Lack of Chemistry: Even if the guy finds the girl physically attractive, there might not be enough chemistry between them to make things work.

5. Personal Issues: Sometimes, a guy might be dealing with personal issues that make him unavailable for a relationship. He might be struggling with emotional or mental health issues that make it difficult for him to connect with others.