Well! my friend why are you thinking more about the quantity of the rose just think about the quality of the rose

Instead of thinking about the number of roses just think about the emotions behind roses

Rose signifies adoration and you should feel lucky that  a woman has given you a rose.

And still if you are confused about what a single rose shows, then i would like to suggest you thatif you both love each other thanthe rose is the symbol of your unification and if it is a one sided love than the rose points out that your relationship is on the right path.

:)