If you’d not think people should keep pets, say something like this. “I do not think people should keep pets because, (your reason) I think this because, (proof and evidence of your answer). In conclusion, I think people should not keep pets.
If you think they should, use this format.
“I believe people should keep pets because (reason), and (reason.) I think this because (proof and evidence of why you think this). If people keep pets (reason.) Therefore, In my opinion people should keep pets.
The artist might be trying to convey that the subject of the song has been in love with the singer for a while now but the subject is too shy to admit it. Hope this helps! :)