The Phoenix Suns may have hurt their relationship with Devin Booker after waiving Tyler Ulis on Saturday.

Per Yahoo Sports’ Shams Charania, Booker is “upset” with the Suns for their decision to release his best friend.

The Suns will presumably try to sign Booker to a five-year maximum rookie extension this summer, they may have to overcome a lack of trust. Ulis was on the books at an affordable $1.5 million for 2018-19, and the Suns are extremely thin at his position.