A new Grey’s Anatomy season 13 promo is revealing just how much damage Alex caused when he attacked DeLuca.

Alex and Jo had no shortage of drama last season on Grey’s Anatomy. After the pair couldn’t seem to get on the same page on where they were in their relationship, Alex got frustrated. It was clear that Jo was keeping secrets and he wanted to know what they were.

Unfortunately for Jo, she turned to alcohol for comfort and got so drunk that she actually spilled her secrets to DeLuca. The real reason Jo can’t marry Alex is because she’s already married to someone to else.

Alex doesn’t even know her real name because she had to change it to hide from her abusive ex. Instead of telling Alex all these things, Jo babbled it off to DeLuca while drunkenly undressing. When Alex walked in their loft to find them together, he assumed the worse.

Watch the promo below from the Grey’s Anatomy season 13 premiere to get a look at the aftermath:

The synopsis for the Grey’s Anatomy season 13 premiere reads:

“When one of Grey Sloan’s own lands in the hospital, Bailey tries to figure out what happened while the rest of the doctors jump in to help. Meredith juggles huge secrets that affect her relationships with Alex and Maggie. While Richard helps Jo with a big decision, April and Catherine clash over the new baby, on the season 13 premiere of Grey’s Anatomy.”

‘Grey’s Anatomy’ returns Thursday, September 22 at 8:00 p.m. ET on ABC!