You are asking the wrong sort of question. What you really need to ask is why love supposedly has more meaning if it is from a "spiritual" or "non-material" realm. I don't think it does; why would it? Why does the source of love change the meaning of it?
Just because we might be able to understand what love is (i.e. chemical reactions) doesn't detract from the feeling we get when we encounter love. If anything, learning about how something works makes you appreciate things more. You all use the internet, and most of you probably have little to no understanding of how it works. Being a computer scientist, and an information security major at that, I understand how the internet works; it's intricate design and setup, the various protocols that go on behind the scenes, and the algorithms that try to keep your data safe online.
Trust me, understanding something doesn't make it meaningless; it gives it more meaning.
Just because we might be able to understand what love is (i.e. chemical reactions) doesn't detract from the feeling we get when we encounter love. If anything, learning about how something works makes you appreciate things more. You all use the internet, and most of you probably have little to no understanding of how it works. Being a computer scientist, and an information security major at that, I understand how the internet works; it's intricate design and setup, the various protocols that go on behind the scenes, and the algorithms that try to keep your data safe online.
Trust me, understanding something doesn't make it meaningless; it gives it more meaning.