From the standpoint of Buddhism, love would be the act of mindfulness—the inner peace and interconnectedness we reach when we momentarily touch Nirvana. In a more mundane sense, loving kindness in our thoughts, words, and deeds is a consequence of love. I would say it's not necessary to "know" the person or thing that receives love; simply being aware makes it possible to express and share this mind state.

I find comfort in soft determinism. As for what is ultimately true, that's something beyond our comprehension. Or worse, it's subjective and vulnerable to personal opinion. Soft determinism suggests that:
Our choices are influenced by prior causes, yet we still possess agency.
Free will and determinism are not mutually exclusive.
Human decisions are shaped by a complex interplay of factors, including environment, genetics, and experience.
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Compassion is the embodiment of love. Through mutual understanding, we cultivate the willingness to connect and love unconditionally. When we show compassion to others, we also nurture ourselves. Ultimately, isn't the union of consciousness – where boundaries dissolve and we recognize our shared humanity – the true essence of love?