Love can be forever; it can last infinitely. Or not. Ask anyone who has ever been in love. In other words, ask anyone. Rare is the individual who has never been in love.
Nothing non-alcoholic, nothing legal, can impair judgment as much as falling in love. Under the influence, you can convince yourself of anything. It's dangerous. It's exhilarating. Hormones, endorphins, serotonin, adrenalin. You're a superhero, a psychic, a goddess, a god; you're unstoppable, invincible and immortal. You believe in infinite love.
Perhaps that is why few marriages stand the test of time. When love changes, and it will, people are just not ready. They refuse to accept it. They continue to seek the rush until the chase leaves them crushed. Admittedly, some things were never meant to be, but others?
Infinite love does exist. It takes a good portion of leeway, continual attempts at understanding, repeated forgiveness, sympathy, empathy, patience and humor, but it's there. Sometimes.