First of all don't listen to all them rumors going round for e.g get 1000 customers. This is what I did and it worked I reset my game even though I had 2000 customers already served. So when I reset my game again every time Dominic came in and asked me a question for e.g one of them was do you want your own boutique instead of saying 'yes' say 'no' and then he says how about we have a chat about it then you go to the park with him and you get flirty and friendly and he says have you changed your mind and you say yes i would love the boutique now then he says excellent we should celebrate how about i take you out for dinner tonight (date) you say yes and that's where he asked you to be his girlfriend and he has already proposed to me on the game and we are getting married in a week. I hoped this helped as I tested it on my friends ds and they have been asked out as well so it is true.

Hope it works for you !!