Questions about the song's meaning.

To talk with the imaginary you,
Sunshine, we sit side by side
You hesitate and move away
Our eyes meeting frequently
Are not free

1. It starts with 'To'. Does it mean 'To talk with the imaginary you' is a noun like "To talk with the imaginary you is sunshine, we sit side by side"? Or is it used without any meaning for just song's lyrics? What do you think?

2. In 'Our eyes meething friquently are not free', is "eyes are not free" another metaphor or an idiom, or this expression has its own different meaning for the song? I think 'free' in here is just the meaning of 'free' as we know. No special meaning.

Thank you!