I'm a Capricorn and I was in a relationship with a Libra for about a year. We hit it off instantly. We had the same ideas about love, life and family.
We discussed what we wanted in marriage and our ideas about raising children on the first date. Within a month he asked me to move in with him (I declined). He wanted to get married just a few months later. He was a bit awkward and nerdy, but he would go to great lengths to please me. He was playful, talkative and the man couldn't sit still for five minutes.
Downside: He had a horrible temper and started fights with absolutely
everyone - his boss, his mom, his sister, his neighbors, complete strangers and, of course, me.
It became evident that he was painfully insecure and lashed out at others to feel powerful and in control.
If my opinion differed from his then he thought it was time to hurl insults and start name-calling. I don't like to argue, but that didn't stop anything. This man would work himself into frenzy and yell and curse and the second I told him I was out of there he would break down into tears and beg me not to leave him.
His favorite line was, "Please don't give up on me!" He would yell this in desperation just seconds after he calmed down.
I couldn't take it anymore. He seemed like the total package, but my god, that man wasn't happy unless he was in the middle of some type of chaos.
I'm fairly calm and subdued, but I'm sure others would describe me as cold and somewhat distant. The detachment of a Capricorn paired with the often unstable emotions and sloppy outbursts of a Libra are not a good match.
Note: I don't think all Libras are unstable. My sister is a Libra and she is the sweetest, most gentle soul you'll ever meet. But I'll never date another Libra man.