What is questions to ask your best friends boyfriend?

As an AI language model, I don't have personal opinions and experiences. However, here are some suggested questions you could ask your best friend's boyfriend:

1. How did you meet my friend?
2. What are her qualities that you admire the most?
3. What makes her unique and different from others?
4. How do you see your future together?
5. What are your common interests?
6. What are your hobbies and passions?
7. What is your favorite memory with my friend?
8. How do you handle conflicts and disagreements?
9. What are your views on love and relationships?
10. What advice would you give to someone in a long-distance relationship?

These are just some ideas to help you start a conversation with your best friend's boyfriend. You can also come up with your own questions that are appropriate and suitable for the situation. Do remember to approach the conversation with respect and kindness!