Are women in Bangkok used to bring friend on date?

When I went to Thailand last month, I met a girl in a club who swept me off her feet. She is sweet and caring. I asked her out one time but I was shocked when I saw her walking closer toward me with a friend at her back. I used to date women from USA before and they came to dates alone. However, single women in Thailand are very vigilant. I wonder if they are really like that or she just thought Iím some kind of a murderer thatís why she brought a friend along. I want to ask her out on a date again but I want us to be alone this time. Is that possible? If I tell her that, will she agree? Doesnít it sound insulting for them?