Looking for book.

I came across a tiktok and they posted a passage from a book they read. But they are refusing to tell anyone the title of the book. Based off of what I read, I would really like to read the book if anyone can help me at all the passage said, "My thumb clicks off the safety in my other hand. Holding the dog tags over my heart, I lift the gun and put it to my mouth, the metal cold on my lips. In front of me, I see her, that beautiful girl, daisy in hand, looking at me like I'm her whole world, and In feel lighter. For her. This is for her. She'll be safe, and I'll be at peace. What more can I do? Dead men can't talk, right?"