I guess it depends on the couple, my gf certainly says I love you a lot
Unconditional love, hmmmm, I feel love is too complex to try and figure out. I am sure we can love people in different ways at one time, but there is always someone extra special. It is strange, I have close friends, and I can skip contact with them for a while, but, if I don't talk or hear from my gf for a few days, its really difficult.
Say it with Flowers, Lol.