Love is an evolved behaviour pattern that involves bio-chemical and electrical changes in the brain that can be observed, and that we experience as the range of feelings we call love. It has survival value for our species.
Religions have personified/deified it as divine beings, such as Aphrodite/Venus and Eros/Cupid.
People who don’t believe in God or gods, or supernatural beings generally, make choices and have the same basic morality as everyone else, as part of the complex behaviour patterns that evolved in our species, and others. When several behaviour patterns conflict in a given situation, our upbringing, experience, need to live as part of a community, and the satisfying chemical changes that evolved to happen in our brains when we do someone a favour, determine which to suppress; this is often done subconsciously, but can sometimes be conscious (which might be what we experience as conscience). And when this goes wrong, we have remedies as a species codified in laws, penalties and punishments.
Having experience of life, I base my choices on mutual respect and compassion for others.
I just don't attribute the origin of moral behaviour to mythical beings, or claim that the way we resolve conflicting behaviour patterns consciously is through something supernatural or that the conscience is supernatural or comes from a supernatural being.