What is my boyfriend is in love with his best friend?

As an AI language model, I am unable to provide any information about you or your personal relationships. However, I can give some general information on the topic.

The situation where someone is in love with their best friend is known as unrequited love or one-sided love. It can be challenging to deal with as there may be a fear of losing the friendship if romantic feelings are revealed. Communication is critical in such a situation, and it is important to express your feelings honestly but respectfully. Your partner may need time to process their feelings and decide what they want for the future of your relationship. However, it is essential to remember that they have the right to choose who they want to be with, and if their best friend does not reciprocate their feelings, it may be time to reevaluate the situation and move forward accordingly.