It can mean so many things that it basically means nothing. Humans are so bad at understanding their own feelings, it is ridiculous. Combined with the inability to observe the internal state of others, our algorithm for determining a consensus on the semantics of language completely breaks down. The result are words like "love". That is the only concept we can reach consensus on and it is so broad it could be basically anything.
A seemingly random human having concerning amounts of power over you without your consent, as if they somehow guessed the root password to your mind. You don't want them to have so much control over you and they never asked for it, nor want to exercise it. Is that love? Is that really the same concept as Romeo and Juliet? Well, no. But then what word can you use to describe it? Why is that even a thing? How can you make it stop?
I don't know how to get answers to these questions. I just don't know what word to type into Google.
