One thing that helped me be very cautious about private revelation, like masondoggy was saying, was when I came to the bit about ensoulment/mediate animation in City of God by Mary of Agreda. It's a fabulous, thought-provoking work... but suddenly finding myself face-to-face with something so aggravatingly medieval was jarring and unpleasant.
Now I don't mind picking and choosing with private revelation... it's okay to take what's profitable and leave the rest. Other things might be flat-out off, or just maybe a person isn't ready at that point in time for one thing or another.
So, while I've never read that particular book, just based on what I've read from the primary sources-- it's great that you have a relationship where you and your boyfriend can read and discuss a work like that together, but neither of you should be afraid to point out things that you have questions or concerns about. They exist.