I know this girl from a apps and after talking and texting daily
for around two weeks I flew over to her country to meet her,
started to have feelings for her and I confessed to her when she
came over to singapore. She said I'm just a friend to her and that
really hurts, maybe I confessed too early as I only known her for
around 3 months.
This coming valantine day I would like to send her flowers but
I'm not sure what kind of roses and how many should I give. I need
advice on this.
you met her on the internet. wow. 
do you really love her, or is it just the looks you are
mesmerised with? 
beware of online scammers. 
there are many people who are cheated of their money by people
they meet online whom they do not actually know in real
life.
nonetheless, good luck. but please be vigilant. 
whereas for how many roses, I think a bunch of roses wrapped
with some nice wrapper would be sweet. 