If the guilt bothers you, tell him and he will probably help you feel less guilty. I found my T's doctoral dissertation and we talked about why I did that, what I thought, etc. and it was very comfortable/comforting and we had some good laughs and it brought us closer (I did not buy/read it, I could barely understand the title and complained about that and she laughed and talked about how boring the subject was and why and what it was like when she was a student working on it, etc.)