No such regrets (boys in Pattaya) from my side. If I met boy B instead of boy A, there must have been a reason (and even if the decision was wrong in hindsight, I had good reason to decide that way).
Nowadays I value a good sleep higher than sex, that's why I have a rule "no sex after midnight", i.e. after 11 pm I do not go on online dating or chat with the intention to meet. Only exception is disco, once per month when I was in Thailand before Corona.
I should have met the one or other boy in Pattaya more often instead of chasing new boys. But I have all their contact information, and will catch up once I'm back!