That’s funny, I was precisely thinking about this topic tonight.
For me, in terms of romantic love, there are three stages: attraction (lust), like, and love. Being attracted to someone is related to the body (beauty / cute, sparkling eyes, lovely smile…). Liking someone happens when you add something related to their mind (natural curiosity, kindness). And love is when something, outside your control, chooses to step on the “caring about that person” accelerator that grows in the “like” phase and goes…
Anyway, I have crashed the ship so many times that, if love appears, I just welcome the feeling knowing that it won’t be fulfilled, and that it will stay with me as unconditional love the rest of my life. Which, by the way, does not imply take advantage of me, which will easily move the clock needle in the worst opposite directions - disappointment first, indifference later.
EDIT: Forgot to say that sometimes, yes, it is possible to love someone whom you know you are not truly compatible with, or that you know it is impossible to be with. The accelerator is really fickle. Also, lust can come first, or like can come first. But the accelerator, it is always at the last stage.