The protagonist has gone through the most temptation in his life, and reflects now that he's happy at home with his one true love. He's past the sirens of temptation, and still remains 'tied to the mast'... i.e. happily married.
'you think you've heard this one before'... meaning you think you're going to hear about a long oddysey.. but the protagonist never made the whole odyssey, because he knows he's happy where he is. "So long hey thanks my friend", bidding farewell to his friends who still 'play'....
The protagonist has gone through the most temptation in his life, and reflects now that he's happy at home with his one true love. He's past the sirens of temptation, and still remains 'tied to the mast'... i.e. happily married. 'you think you've heard this one before'... meaning you think you're going to hear about a long oddysey.. but the protagonist never made the whole odyssey, because he knows he's happy where he is. "So long hey thanks my friend", bidding farewell to his friends who still 'play'....