@Garrett **********
the reason I asked is because section three of the non-o guidelines reads;
3. A person who provide or receive support from the person whose nationality is Thai or the alien who has been granted and has taken up permanent residence in Thailand as the parents, spouse or child under patronage and being a part of the household of the said person.
The way that is worded would suggest that a girlfriend/boyfriend would qualify if they were dependent on the person working/studying in Thailand.