What is the meaning of love?

Sometimes, I question what love is. I know the definition, but it's deeper than than. I know how it feels to care for someone and vice vers, but what's the difference? My SO and I say we love each other and we are always supportive of each other's hobbies, likes, tv shows etc. We can talk for hours, and it feels like minutes, but I catch myself thinking too hard sometimes, I guess.
What is the meaning of love?
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