Just look back on a story posted on this site a few days ago. I don’t have a link but the story line was very similar to yours. The guys name was Ahmet and he had never met his Thai girlfriend before. Bottom line is that his online romance and commitment to marriage cost him 380,000 baht.
Be afwaid, be very very afwaid as Elmer Fudd would say.
Found the link
https://aseannow.com/topic/1337385-swedish-man-scammed-by-thai-woman-loses-over-300000-baht/page/2/