Drew Barrymore and Justin Long Drew Barrymore and Justin Long

Though Drew Barrymore and Justin Long have been seen together a lot since breaking up last July, Barrymore says their relationship is purely platonic.

"We're good friends and we're doing a film this summer and I think it's very confusing," Barrymore said during her appearance on Ellen on Friday to promote her new HBO film, Grey Gardens (premiering Saturday at 8 pm/ET). "We're dear friends. I guess people find it a little confusing. I totally understand. It seems like, 'What is the deal with them?', but we just adore each other."

Barrymore said her ex is a "great guy and he deserves the most happiness." But she said she's "just not ready" for a relationship.

"I've spent two years really with a very different life than I've had before," said Barrymore. "My priorities have changed. I directed a film. I did this drama [Grey Gardens]. It was something I've never done anything like, these two challenges, and I don't know how to maintain a relationship, to be honest, while I'm doing all of that."

While Barrymore opened up about her personal life on Ellen, she said on Regis and Kelly that she doesn't post her every move on Twitter like some other celebrities. (Of course, you can satisfy your Twitter fix by clicking here to follow TVGuide.com.)