When I listen to this song I think about how sometimes people are described as vapid or empty, like a pretty, lifeless doll. This kinda comes through in the lines "and she sits on my shelf, it makes me think of you [...] she's a lot like you," like he's comparing a past lover to an inanimate object, and maybe when he says "I feel so all alone," he isn't just thinking about himself now, with the doll, but the time he was with his lover too.
When I listen to this song I think about how sometimes people are described as vapid or empty, like a pretty, lifeless doll. This kinda comes through in the lines "and she sits on my shelf, it makes me think of you [...] she's a lot like you," like he's comparing a past lover to an inanimate object, and maybe when he says "I feel so all alone," he isn't just thinking about himself now, with the doll, but the time he was with his lover too.