In the zodiac, Aries and Libra are opposite to each other. They're considered opposite signs, and there are good things to say about being opposites and negative things to say. Opposites tend to attract, because one has what the other needs or looks for. Opposites also can repel each other, because they are so opposite.
Now Aries and Libra as a pairing, being opposites, they do work well at the beginning. Aries is intrigued by Librans' positive attitude about relationships, about being in love. They both love to be in a sexual relationship. They both have a romanticism about them, and in many ways they both look good together. Because whether male or female they tend to be beautiful people, and they work well out in society. I know it sounds silly, but they look good as a couple.
Then we come to the inner differences. Libra can get very dependent and also very resentful of the Aries bossiness or the Aries wanting to be first or the Aries wanting the attention. Libra wants attention as well. So they may become competitors for attention.
Also, they look for different things in life, as far as Aries wants to be the one who achieves and is known, to become famous for being wonderful, for doing wonderful things and going wonderful places. Libra, in turn, wants a life that is more serene, more elegant, more cultured, more artistic.
Both of them can be spendthrifts, and they love spending each other's money. So they have to work that out as well. But there are good vibrations there. There's a good possibility if they can work out the differences in temperament. What they have that glues them together is that each of them has what the other needs.