Oh, My Dearest Love
This means he's talking to Tifa, that's not the answer but that's a clue in itself.
The Secret Thing You've Been Hiding
Maybe meaning - Tifa was hiding the fact that Cloud shouldn't be experiencing those memories that way.That it was someone else's memories.
If I Look, Will I Find You?
If I Find You, Will I Lose You?
This is all very cryptic.