Lyric discussion by CuChullain 

Cover art for Come on Home lyrics by Franz Ferdinand

i think it's about this guy whose ex, friend, or someone he just had a fling with lives too far away for a relationship and he enjoys the heartache of separation because he uses it as a safety-net or an excuse to avoid pursuing other things and protect himself from repeated failure, hence the line: "so come on home, but don't forget to leave".