This can have a somewhat superficial meaning to it, but it is pretty accurate to that line of thinking. This goes along with the fact of how the inability to have what the heart desires can cause so much distress. "Wanting what you can't have" is one of love's most imminent themes. How many movies with a love story are there where there is no competition for someone's heart/attention? None that I've ever seen. Competition is part of the fight for love. Helena cannot stand the fact that she is losing the competition to Hermia for Demetrius's love. It makes me think of how many times my friends will get back together with their exes because they cannot stand the sight or even the thought of their ex with somebody else. Helena's words bring out that type of emotion.
Helena takes her feelings of rejection to a different realm of truth, in which she begins to diss her lover. "Things base and vile" this shows that she feels there are things about him that are disgusting or unattractive. I can think of times in my life where I would turn on the person who didn't like me, especially to my friends. "Bro she's ugly anyways," or "Dude she's not that cute when you think about, and she makes bad grades." Things of that nature are normal in this kind of situation. There aren't too many people who would react in such a way as to say, "Yes, my lover is definitely making the correct choice by choosing her over me. What a great and wonderful thing that has transpired!".
To take a spin on that part of her remarks, she says that those base and vile things about him hold no quantity, as if they don't matter because of the admiration she has for him. This, to me, is a very true calculation of love in its true form. Many a times I have seen a couple and thought to myself, "How did he get her?" when a not-so-good-looking fellow is dating a girl who is a smoke show.
