The Lover's Dictionary by David Levithan

corrode, v.
I spent all this time building a relationship. Then one night I left the window open, and it started to rust. -p. 64

lover, n.
Oh, how I have hated this word...I have never wanted a lover.  In order to have a lover, I must go back to the root of the word. For I have never wanted a lover, but I have always wanted to love, and be loved. - p. 137

dispel, v.
It was the way you said, "i have something to tell you." I could feel the magic drain from the room. -p. 74

I, n.
Me without anyone else. - p. 113

idea, n.
"I'm quitting," you say. "I can't believe how wasted I was. This time, I'm really going to do it."
       And I tell you I'll help. It's almost a script at this point. - p. 114

love, n.
I'm not going to even try. - p. 136

motif, n.You don't love me as much as I love you. You don't love me as much as I love you. You don't love me as much as I love you. - p. 144

recant, v.
I want to take back at least half of the “I love you”s, because I didn’t mean them as much as the other ones. I want to take back the book of artsy photos I gave you, because you didn’t get it and said it was hipster trash. I want to take back what I said about you being an emotional zombie. I want to take back the time I called you “honey” in front of your sister and you looked like I had just shown her pictures of us having sex. I want to take back the wineglass I broke when I was mad, because it was a nice wineglass and the argument would have ended anyway. I want to take back the time we had sex in a rent-a-car, not because I feel bad about the people who got in the car after us, but because it was massively uncomfortable. I want to take back the trust I had while you were away in Austin. I want to take back the time I said you were a genius, because I was being sarcastic and I should have just said you’d hurt my feelings. I want to take back the secrets I told you so I can decide now whether to tell them to you again. I want to take back the piece of me that lies in you, to see if I truly miss it. I want to take back at least half the “I love you”s, because it feels safer that way. - p. 169