I don;t think you need to slow it down, just not do anything to give false impressions/promises.
If you manage expectations properly you can have a girl that thinks you're amazing and sees you as a great catch, but knows you're not looking for anything too serious at the moment. Cool girls can handle that, at least for a while. Only the neediest girls fall in love despite clear and mature messages from you that it's not going to be that intimate.
edit: just saw you said "Thai girl". Yes, they are like that; get way too attached too quickly. I think it's cultural, every Thai girl I knew was like that. Not sure you can do much about it.
If you manage expectations properly you can have a girl that thinks you're amazing and sees you as a great catch, but knows you're not looking for anything too serious at the moment. Cool girls can handle that, at least for a while. Only the neediest girls fall in love despite clear and mature messages from you that it's not going to be that intimate.
edit: just saw you said "Thai girl". Yes, they are like that; get way too attached too quickly. I think it's cultural, every Thai girl I knew was like that. Not sure you can do much about it.