He is talking about how he wishes to be with the lady, but sadly she is already taken. So he is saying, what should I do since u found ur love already...
It means the one you was like and loving him so much, have been taken by someone else . In old days you didn't say anything about your love. So now you feeling so shy
I feel shame coz that time I loved u but I can't say it now it's too late, I always remember when I hear this song is remamberable to me, I love it 😂😂😂