I think a lot of the songs on this album have a lot to do with how leaving and being away from loved ones to be on the road affects the band personally. Obviously the person he's leaving behind is skeptical about whether he will really be coming back. It sounds like she has gotten used to him being on the road and away at shows, so she's not really expecting anything to change. But basically he's telling her that being with her is where he feels most comfortable and that he isn't going to give up on the relationship, even if she does. Everything he does is for her, and one day he will come home to her and never leave her again.
I think a lot of the songs on this album have a lot to do with how leaving and being away from loved ones to be on the road affects the band personally. Obviously the person he's leaving behind is skeptical about whether he will really be coming back. It sounds like she has gotten used to him being on the road and away at shows, so she's not really expecting anything to change. But basically he's telling her that being with her is where he feels most comfortable and that he isn't going to give up on the relationship, even if she does. Everything he does is for her, and one day he will come home to her and never leave her again.