Is love a social construct? Or is it a biological response to something? Or is it a psychological weakness?

I have heard so many theories about what love.
Here are the three main theories I have come across:

1) Love is a social construct: something humans have created.

2) Love is a biochemical reaction in the brain. Like cocaine, it can become a dangerous addiction

3) Love is a psychological weakness: a need for us to fulfill our unmet needs.

Oh, and I do mean “romantic love” specifically