Since I did not enter a committed relationship when I was five, the answer is no. I have never fought with a significant other I have known and loved for 18 years.
But it is beside the point. We are not saying the film is not powerful and sad. We are just saying there is an element of humor at play alongside the drama. I am almost certain Linklater and the actors were conscious of the comic quality of the Sylvia Plath reference, for example. The fact you reacted to it with stony solemnity is fine, too, of course.