I ended it. She was talking about wanting to see other guys and being single again, and I said there wasn't a point in continuing a relationship at that point.
Been having a hard time moving on, and what you said is really helpful. Especially "if you take her back she will start looking at other guys again in no time". It's something you've got a hard time admitting to yourself - and having someone else spell it out to you means tons. Thanks, brother!