This will be my first post on the forum so: Hi there, everyone!
I thought it was interesting to see this thread since I just got Tower in the outcome position in a love reading and I’m VERY single.
Tower has such negative connotations and I wish I could have gotten a clarifier to discern what sort of upheaval the card speaks of in terms of my love life. I saw someone mention Love At First Sight and I would definitely agree if it was paired with Lovers or Ace of Cups, but on its own it can be anything really that causes a minor or huge earthquake in your life.
Personally, I wouldn’t read it as a loneliness or isolation card, as mahafrins suggests (but we all have different interpretations and experiences with the cards). I wouldn’t be so certain that it always speaks about a negative event either, even though, as Grizabella says, it shows people wearing crowns being thrown out of their ivory tower. To me, this very fact, just symbolizes that the status quo is being challenged; a paradigm shift. If the current situation is dissatisfying it could very well be a positive event.
Hence, I would probably read it as a sudden event or a major transformation. It could be good or bad, but without a clarifier it’s nearly impossible to determine the effect. Yet, if you follow the theory of a paradigm shift it would depend upon the querent's present situation. If you're unsatisfied being single, it could possibly speak about a person coming into your life and challenging the status quo of "singlehood".