Strange Encounter

One day Tommy encounters a strange man who tells him his future self's biggest regret in life. The man knew too many things about him, and gave a horrible forewarning. But, just how much of what was said should Tommy believe? Was he really being given a second chance to live without harbouring regret? Or was it all just a cruel lie?
Tommy needs to figure it out quickly before it's too late, or he will have to live with his choices forever.