Frankie Muniz's girlfriend journaling their lives to help actor's memory loss

Former child star Frankie Muniz fears his severe memory loss issues will destroy his relationship with his girlfriend.

The actor, who is now a racing driver, has suffered nine concussions and several mini-strokes since finding fame on TV comedy Malcolm in the Middle and he can no longer remember his time on the show.

To make sure that he can recall moments from his two-year romance with girlfriend Paige Price, she has started writing a journal for his reference.

"I get sad at the thought of losing a memory," he tells Access Hollywood Live. "She's a writer too, so she's amazing in detail in the way she writes."

Frankie, who is currently competing on U.S. TV show Dancing With the Stars, admits he has no memory of a trip to Australia last year (16).

"I've seen pictures," he says. "I was on top of the Sydney Harbor Bridge... but I don't remember climbing it."