Here is another chart factor I am observing on a repetitive basis in different charts. If the sign of the annual profections of the ascendant, fall as a sign of the descendant (7th house) in the Solar Return, it will activate the subject of partnership in that year, and if all other things remain equal, marriage. I have observed it in activating the subject of open enemies and forming of other types of partnerships too (not necessarily love). Other factors will tell you what of the above may prevail. Astrology is all about combining the different factors into a final conclusion (judgment).