How do you say "will you go out with me?" in cantonese?

"Will you be my girlfriend" in Cantonese:
妳可唔可以做我女朋友呀?
lei hor mm hor yee jo ngo lui pung yau ah?

"I really like you" in Cantonese:
我真係好鍾意妳o架!
ngo chan hai ho chung yee lei gar!

i don't know...but thats so cute

o5 oi3 lei5 = "I love you"

If you're asking out a Cantonese speaker, make sure to do some research on the tones so you don't sound like a douche. I can't type the diacriticals so I just used the numbers from Jyutping Romanisation.