This is new to me! I didn't know it was a series. Someone else mentioned it but y'all gotta check out the Margot Robbie version of this. Only one I've seen but amazing.
She is obviously with him because they have history together. She may not have always been beautiful. She may have been fat with bad hair, bad teeth and terrible eczema. And he is, well, Matt Pat Schatt. They may have been childhood friends growing up together, and they were all each other had. Or, she was always beautiful and they were childhood friends, but she never saw him as a romantic partner. He supported her and was with her through all her terrible relationships. And after every one ended, while crying, she would always say something like, "why can't guys be more like you?" Then after more than ten of these, she would realize that he IS a guy like him. Anyway, this sketch is the definition of "you do not love someone because they are beautiful, they are beautiful because you love them."