Thomas is crawling so fast now!

Thomas is crawling so fast now! I can't leave him alone for even a minute. I put a safety gate on one side of the bed where he usually lays and plays there while I sit next to him. However, when I get off the bed on my side, the first thing he does is quickly crawls over to the edge on my side of the bed! Sometimes, I pretend to get off and leave, and then I'd turn around quickly, and he'd laugh and tries to scoot to the bedside even faster.