There could be several reasons why a guy would sneak up on you. They may do it to surprise you with a gift, or they may do it to scare you. Either way, most people do not like to have someone else sneak up on them.
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There could be various reasons why a guy may sneak up on someone. It could be playful or mischievous intent, trying to surprise you, or possibly to eavesdrop on a conversation. However, it's important to consider the context and assess the situation to ensure your safety and comfort.