Regards the chap Brian who pays his GF a 30,000 baht salary each month – Brian your first step should be to cut your GF salary by a lot and ask her to get a decent job. Two months ago I did the same just gave 6000 baht. Now I cut it to nothing. She is now forced to work at the farm for 200 baht a day to survive. Maybe now she appreciates the money better again, or might turn up working in a bar. Whatever I fed up with this prima donnas.
I think you have to rethink what you want out of a GF. If it is someone to share your life with, that is a lot different from someone you just share your bed with. You do not seem to have much affection for your GF, so I think it is better for both you and her to go your separate ways. You have to learn about commitment first, and you haven’t any.