03/10/2011 at 03:00 PM EST
It's been one year since Corey Haim died at the age of 38
, and for his mother, Judy, it's still a struggle to believe he's gone.
"It's harder for me because, as you know, I lived with Corey … and we've spent so much time together, and we've done so much stuff together, and we went on holidays together," Judy Haim tells Entertainment Tonight Canada
in a new interview. "It's, like, mindboggling ... I do pretend sometimes that he's on location somewhere."
But Corey, who died of pneumonia and a heart condition, is still a major presence in her house. "I have his pictures all over the walls," Judy says.
She adds that the grief is sometimes like a rollercoaster. "I have my good days," Judy says. "And … all of a sudden I'm getting this wave that's, like, impossible to deal with."
Ultimately, she remembers her son as being "very sensitive … very loving."
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