"Hmmm trying to find more on the betrothal and what actually is occuring..."
It is the first part of the overall wedding ceremony when the rings are blessed and exchanged. The bride and groom say nothing. Centuries ago the betrothal ceremony apparently could and did occur separate from the actual marriage sacrament. There is the belief that this allowed the man certain marital rights with his intended. Maybe it did; I don't know.
A couple of years ago a couple of immigrant Greeks came to the priest in our parish asking him to conduct a betrothal for their no good son and his unbaptized live-in (in the family house) girlfriend, apparently believing that this would somehow legitimize the illegitimate goings on. The priest refused and the Greeks exploded. Later when the girl became pregnant and the boy paraded her at the Divine Liturgy, the parish was scandalized (these people vome to Liturgy maybe twice a year). But it got worse when he approached for communion and the priest refused him quietly, blessing him with the cup instead. This time the Greeks really went bizerk...during the Liturgy! They apparently plan to bring all the other immigrant Greeks who never come to Liturgy to the general assembly this year to "get rid of that priest"! Just lovely people!
The lack of respect some folks have for their priest or bishop is truly scandalous in some places.
I'm on a lot of MP-ROCOR reunion lists where fringe schismatics spam volumes about how they hate the MP all the while spouting purly protestant rhetoric to justify their shishmatic stance.