Usually wire rope cutters like this one won't fray cables but it does happen, especially if the cutter is dull, or if you used one with a wide curvature. I gather you did use the smaller notch.

As you saw, the cable can usually be rewound win your fingers and a crimp slipped on.

When cutting the wrong head off a new double ended wire, be sure to cut right at the head. Often some zinc will down in to the cable for a few millimeters, so cutting roght at the head may prevent fraying.

Other tricks that you can try if fraying is a constant bother is apply a drop of super glue where you plan to cut and let it cure before cutting, wrap the wire with with a short piece of adhesive tape prior to cutting, and cut through the tape. Also if you're truly OCD, you can slip a length of heat shrink tubing down the wire down to where you want to cut, shrink it to a ight fit, then cut and leave there as a crimp.

The shrink tubing method does a beautiful job but don't expect pros to do it. The reason metal crimps are used is that they take no time at all.