Seth Rollins recently commented on Dean Ambrose leaving the company during an interview with WWE.com:

“It breaks my heart,” Rollins said about Ambrose’s departure. “I get it. I understand this place can be frustrating. He’s a guy who’s been doing it nonstop for 15, 16, 17 years. Sometimes you just need to step away and take care of yourself. I wish him luck in whatever he wants to do.” 

He added, “I know how he feels about his creativity. Sometimes when it pulls him in a different direction, that’s just how he’s gotta be. I never imagined the three of us working anywhere else or not being here at the same time.” 

Seth talking about Dean not re-signing his contract and leaving the company (I'm not crying, you are) pic.twitter.com/odCbjBYhAl

, vine (@tyIerblack) 3 April 2019