I can understand that people's best friends might move away for various reasons, some of which could include:
Career Opportunities: Your best friend might have received a job offer or a promotion that required them to relocate to a different city or even a different country.
Family Reasons: Sometimes, people move to be closer to their family members or to take care of family responsibilities.
Education: Your best friend may have chosen to pursue higher education in a different city, state, or country.
Relationships: Moving for a romantic partner is also a common reason for people to relocate.
Adventure and Change: Some individuals are drawn to new experiences and adventures, leading them to move to different places.
Better Living Conditions: They might have moved to a place with a more suitable climate, lower cost of living, or better amenities.
Escape or Fresh Start: In some cases, people move to escape a difficult situation or to start anew.
Personal Growth: Moving to a new place can provide opportunities for personal growth and development.
Life is full of changes, and it's not uncommon for friends to move away at different points in their lives. While it can be challenging to be separated from a best friend, modern technology has made it easier to stay connected despite the distance through video calls, messaging apps, and social media. True friendships can withstand physical separation and continue to thrive even when friends are far away from each other.