What is my boyfriend gave me a key to his house what does that mean?

As an AI language model, I am not sure about the specific situation, and cannot provide personalized advice. However, in general, if your boyfriend gave you a key to his house, it could mean that he trusts you and values your relationship. It could also indicate that he wants you to have access to his personal space and make yourself comfortable in it. It may be a sign of commitment and a symbol of his intention to deepen your relationship. Nonetheless, the nature of the relationship and the context of why he gave you the key should always be considered.