What means ex best friend?

One who is no longer a friend; a former friend.

Who is Machine Gun Kelly’s best friend?

From costars to besties! Machine Gun Kelly and Pete Davidson have often hyped each other up throughout their time in the spotlight.

Machine Gun Kelly Dedicates New Song “Last November” to His and Megan Fox’s Unborn Child.

Yes, it’s absolutely possible to be friends with your ex. Whether it’s a good idea will depend on the situation and the people involved.