Your visa application should show onward travel within 60 days.
Your airline is likely to check this as well.
If you get a 60 day TR visa, do print it out, you'll need it when first arriving in LOS and you'll also need to show it to obtain your 30 day extension.
One 30 day extension is allowed with the 60 day visa, it costs 1900 baht, done at Chaengwattana, counter J.
in fact, there's at least one senior, upcountry officer who does lurk here and a few other sites, Jack. She started lurking back in the old Thai Visa. com & nanaplaza .com days 20+ years ago...
Me mates' longtime gf.
Congratulations on your upcoming wedding, marriage. Do know that any "village" ceremony isn't officially recognized until you properly register your marriage. As you are American, I'll allow others to advise you. No fiancé visa, though.
Seems you're planning a "border bounce" back into LOS
Best to have the 3 proofs in any case:
hotel booking for a few days & onward travel reservation within your allowed "visa exempt for tourism" stamp days in & 20,000 thb or equivalent in $ £ € in CASH is needed.
You'll likely be questioned by immigration because you said you had an Ed visa.
Don't sing that "Thailand is My Home Now" song if you're re entering as a tourist obstensibly, mate. 🙃 555