Throughout the book, it is not always clear who is speaking or who they are speaking to. We have notes telling who some scholars think the speakers are. In 3:1-4 The woman speaks to herself.
The soul is a metonym for the whole person. Here it makes a stronger statement of the woman's love for the man than "my beloved" ([Song of Songs 1:14](../01/12.md)). (See: [[rc://en/ta/man/jit/figs-metonymy]])