I feel like this song is about a guy that is with a girl but she is really closed off and secretive, possibly has anxiety. He's telling her that she can trust him, because right now she doesn't because she's afraid of being hurt; But in reserving herself and bottling things up it "damages" her anyway. He won't judge her and that by getting out what she needs to, it will prevent her from being "damaged".
I feel like this song is about a guy that is with a girl but she is really closed off and secretive, possibly has anxiety. He's telling her that she can trust him, because right now she doesn't because she's afraid of being hurt; But in reserving herself and bottling things up it "damages" her anyway. He won't judge her and that by getting out what she needs to, it will prevent her from being "damaged".