Love marriages were always a thing in western society, but only when a lot of property wasn't on the line. Aristocrats continued the arranged marriage scheme, possibly even today, because of the economic and political concerns, as well as classism, that marriage and offspring create. Other societies that rely on arranged marriage almost always have a very strong class consciousness and a view of the family as the primary social organization; religious communities also tend to have matchmakers and such, Anabaptists and Jews come to mind, in order to keep the community going. You saw a greater acceptance of love marriages with the transition to a money based economy as property and real estate became less important and the position of women changed. Urbanism also increased the trend as children and wives became relegated to being biological toys and showpieces rather than equal partners in the family franchise.