Maybe not /some depends on CO but lack of visits for 1st denial will weigh heavy if they don't see each other more
TO the OP
u need to study and learn the process of touist , K1 and CR1 steps , pros and cons of each one, the wait times and the cost
K1 is more costly in the whole process and can take as long as a spouse visa
and would mean if u want to marry in Brazil , u can have a 2nd ceremony after marriage in US and the long wait for AP and green card