I think love exists in the mind- preferably multiple people's minds- reciprocated between them. I don't see how it exists outside of a living being though. Not as a separate entity. I guess love is a little like gravity except, more discrimatory. It needs sentient beings to be created but, it doesn't necessarily materialise when sentient beings are near one another.
I suppose what's weirder are the various forms of love. I think you can love friends and family members or pets in a different way to a romantic partner. I feel sure I went through limerent crushes- which shared commonalities with love but were more crazy and, not entirely based on real life! We'll even say we 'love' objects or activities that we feel a deep connection to. But- it's a feeling. Feelings feel real- even if we can't necessarily see them.
What's maybe more troubling is the levels of love we are capable or, incapable of. I'm not sure everyone loves in the same way or, to the same extent. For all sorts of reasons. Some people just seem colder. Some have been hurt so, seemingly become more closed off- to protect themselves.
Plus, I think there is selfish love and, selfless love. When we want to love, how much of it is about us wanting to love that other being versus how much we want them to love us? I think that gets reflected in the way we treat one another too.