Lyric discussion by hemanta 

Cover art for Goodbye lyrics by Air Supply

it's about a guy realizing that she is meant for someone bigger than his stature .. he is in love with and even she's in love with him .. but he knows he will only be pulling her down with his low life .. he is taking the harder decision of breaking up .. he wishes her better.. and may be this will justify the song too.. they are in love .. the girl's been just perfect while he might have had not been as faithfull.. now he regrets that he betrayed her and has ultimately found himself to be the lowest of the creature and cant imagine how someone perfect as her should get stuck with this lowly creature.. so he's freeing her.. now that's love.. to let her go for her betterment..and taking the blame