I can only give my thoughts or non-advice from the perspective of my own relationship with my husband. Since he is not a fan of poetry at all a gift like the one you are thinking about giving your boyfriend would mean very little to him. Has he ever given you anything of sentimental value? That might be something to consider. It would all depend on how close the two of you are I think. I have given my husband so many gifts of my own creation, things that I worked days and weeks on, and truthfully, I don't think he was impressed by any of them, or if he was, not to any extent that would be worth the love, time and effort I put into making them. I'm not thrilled to report this, but it's true. A fishing rod or a lemon meringue pie - now that he would remember.
He's a materialist.
Over the course of my life I have made and or given many people things that I myself cherished, thinking that they too would cherish them. I really have to restrain myself, refrain from giving my cherished items to others in order to express my love for them. I guess I should be more selective as to whom I give such items. Some of the things I gave away can not be replaced, which would be fine, if they were accepted and lovingly kept and remembered by the folks to whom they were given.
So, if you really love that little book (perhaps someone who loved you gave that book to you knowing, hoping you would love it) think twice before giving it to someone else, in this case your bf, who may not think it as wonderful as you do. I think giving him a book of your poetry and other momentos would be fine, in a book that is non sentimental. Would I take this advice if I was your age. Not in a New York minute.
I was so much older then, I'm younger than that now. Dylan