It's not just Thai girlfriends that get denied. My Belarusian girlfriend was also denied although she is an architect who owns her own home. No reason given and no option to appeal. She visits me in Thailand without issue. American immigration are full of themselves, they are convinced everyone wishes to live there and will not leave.
I am in and out a lot. Typically two months in Thailand then a month in Vietnam. Then repeat before returning to France for the European summer. I have to renew the Non O extension of stay, commonly called a retirement visa each year.
It should be no problem. Will your 1st 60-days in Thailand be visa exempt or a tourist visa from the Thai embassy in Paris? Currently, Thai government looking at reducing the 60 day visa exempt to 30 days, so you need to keep an eye on that. I split my year
*****
living in Aveyron and South East Asia. Because of frequency of travel, I switched to a Thai Non O retirement Visa to avoid difficulties when reentering Thailand. Hope you have a great vacation.
just checked, they are currently unable to offer assistance with regards to opening a bank account in Thailand due to a recent change in the law. They are however hopeful that this will only be a short-term issue.