Okay, here is the lovedoctor of the Netherlands. There are a few thinggs you can say to the girl.
"he schatje" means hey baby
"ik houd van jou" means i love you
"ik heb een kip geneukt?" means do you wanna grab a drink?
ik ga je helemaal onderkotsen im gonna make love to you
ik wil een vuist in je stoppen means stop making me crazy
say what is in your heart... simple compliments such as "you are looking beautiful" will let her know you do care and take note of her.
'pretty girl' is in Dutch 'mooie meid' or 'knappe meid'
Meisje
Dutch: Wil je mijn vriendin zijn? :P
hey meisje!
say, "honey, what can i do to show you that i love you?"
compliment her honestly not fraud compliments
Tell her that she is beautiful, sweet, funny, nice(only if she is those things). listen to her but most of all be who you are not a romantic boyfriend. A girl truly wants a guy to be honest with her and to be himself.
A DOZEN RED ROSES
Tell her. Tell her with words if you can, or with something like a song or a romantic meal if you can't say it.
You probably just should say thanks and keep being "romantic." Only if you like her though because if you don't, save yourself trouble by breaking up with her because as soon as that person said you're romantic means... well you can picture that.
Well you can type up what you want to say and put it into google translate.