What is his voice gets higher when he talks to me?

As an AI language model, I do not have enough information to provide a specific answer to this question. However, generally speaking, people's voices can change in pitch or tone when they are speaking to someone they are attracted to or nervous around. This can be due to a physiological response, such as increased blood flow and muscle tension, or an emotional response, such as excitement or anxiety. Additionally, some individuals may intentionally modulate their voice to appear more attractive or charismatic to the person they are speaking to.