Only one red rose means " I love you".
It is the purest way to show your love. And another meaning of them is "Marry Me".
The mixture of romance and pureness.
So it is not a good idea to give them to your significant other.
Passion and purity.
"I will always be with you"
Just like roses the red one represents romance and the white one represents pureness.
Sincerity and loyality.
Pink: "You bought joy into my life."
Red: "I love you deeply."
White:" You have a pure heart."