No, it's possible to love someone but also realize you are in a toxic relationship. Love conquers all is a "romantic notion." However with age and experience comes wisdom. Eventually one removes their "rose colored glasses" and views a relationship for what it really is.
There are only two ways to experience joy and peace of mind in relationships: We either get what we want or we learn to be happy with what we have.
Some people stay in unhappy relationships because they don't want to start over.
"Staying together for the sake of staying together is not a recipe for happiness; it's a design for building a prison."