It seems you're asking for a guide to the lyrics of the song (আমি সেই সুতো হবো).
Would you like the full lyrics in Bengali script with an English translation line-by-line? ami sei suto hobo lyrics
Search in Google or YouTube for "Ami Sei Suto Hobo lyrics Anupam Roy" . It seems you're asking for a guide to
The core metaphor: A garland of flowers (মালা) needs a thread (সুতো) to hold all the flowers together. The singer tells their loved one: "You are the beautiful, fragrant flowers. Let me be the simple, strong thread that holds you together. Without me, you scatter; without you, I am nothing." I am nothing."