John Stamos is reportedly heartbroken that Mary-Kate and Ashley Olsen won’t reprise their role as Michelle Tanner on the upcoming Full House reboot, Fuller House.

Stamos, who played Uncle Jesse in Full House, and is both producing Fuller House and reprising his Uncle Jesse role on a guest-starring basis.

The new 13-episode series will premiere on Netflix next year.

John Stamos took to Twitter to voice his disappointment in the Olsen twins’ decision.

#heartbroken

— John Stamos (@JohnStamos) May 23, 2015

He shared another Twitter message shortly thereafter, offering a bit more of an explanation.

I understand they're in a different place and I wish them the best. I promise you will not be dissapointed with our reunion and spin off!!

— John Stamos (@JohnStamos) May 23, 2015

In addition to John Stamos, Fuller House will feature Candace Cameron Bure, Jodie Sweetin, and Andrea Barber in feature roles as D.J. Tanner, Stephanie Tanner, and Kimmy Gibbler, respectively. Lori Loughlin, Bob Saget, and Dave Coulier will guest star on the Full House reboot.

John Stamos also issued a statement via Facebook about the love the Full House actors have for their roles.

There can’t be too many people who are surprised that Mary-Kate and Ashley Olsen aren’t returning to Fuller House. Hopefully once filming for the Netflix show begins, John Stamos won’t feel as much heartbreak and will instead feel only excitement and joy.

John Stamos is not happy that Mary-Kate & Ashley Olsen aren't joining Fuller House… http://t.co/3qOcI7yDlQ pic.twitter.com/lOIHYBphRO

— E! Online (@eonline) May 23, 2015