@Sarah Re: Permission to ask a COMPLETELY off-topic question…?
Micro USB cables I have ever had personally go 'a bit weird' tend to be ones that the cat chewed.
However, I have noticed a disparity in quality of cables which I think is down to the wire used.
IIRC, more thinner strands of cable are better than less thicker strands for longevity. However, thinner strands are more costly to produce. Since cables are inherently seen as consumable and a necessary in most packaged devices, you tend to get cheaper ones.
Interestingly, the cable that came with a Palm Pixi a good few years ago is one of my favourite go-to cables when travelling because it is pretty robust. Despite the tooth marks.
edit: Re-read your post. When you say 'ruptured', do you mean the insulation only around the bottom or actually the wire cable starting to show?