Man, I wish it were that simple. Paperbacks aren't all the same. Different print runs, publishers, even regions have different page counts. I've got a US trade paperback from the Berkley imprint on my shelf right now, and it clocks in at 384 pages. But I've definitely seen people online quote 390, and I think some earlier printings or international editions might be a bit different. The font size and spacing can shift things.
If you're trying to gauge reading commitment, I'd say trust the word count more than pages. It's about 100k words, which for a contemporary romance like this is a pretty solid, satisfying length—not too short, not a doorstopper. My 384-page copy felt like a perfect weekend read.