Wow. There is no way in hell a normal heterosexual man with any significant experience with good looking women wrote that article. That's the most AFC mangina twaddle I've read so far this year (and I generally don't use those terms... but it is what it is). Note that -all- of the numbered items are purely the man's fault, and none on the woman. Note also that despite the title, those aren't signs at all but just cliched flaws or faults that lead to signs of breakup. Here is my list of real signs from experience, not because my weepy platitudinous male vagina told me so to write a BS story for a website, but because this is how it is:
1. A significant change in pattern of behavior that could include many variables, diet, gym, classes, more or less personal or phone contact, dress, spending, drinking, more sex. less sex, nights out without you, a whole host of anomalous change factors possible here. She is beginning to recreate a life without you in it and planning to get back on the horse pronto after she mopes for a weekend about what may take you months or years to get over. She is already broken up, may not even know it herself, and is healing herself so that by the time you aren't conveniently around, her life is already restructured. Keep abreast of her habits and curious changes in them.
2. Your gut tells you something is not right, a fishy feeling of sorts, and you have little or no history of jealousy or clinginess in relationships. Where there is smoke there is fire. If you are good at cards, gambling, stock market, always factor in your subconscious. We receive cues all day every day through every sense that we discount because they can't be verbalized. Get in touch with your subconscious and get caught offguard by women much less.
3. Poker type tells in communications. Telling you too much information, more than is necessary, about comings and goings. Going into infinite detail about minutiae. Strange "testing" tension in the voice, shifting eyes, etc. are possible indicators. Lots of talk about her friends and their BFs, even if framed a bit negatively, she is still telling you, "you don't measure up." These depend on the woman in question, most women are lousy poker players and show their hands constantly.
4. New work friends or groups, lots of phone/text with new people, particularly male "friends." Women almost never break up without a new branch unless you have done something truly abhorrent, they will be cultivating these new branches long before the actual breakup.
5. Sexual, in line with changes in 1, but deserves it's own category. They will reduce the amount of sex overall, then be very demanding of it out of the blue. They will appear or dress unattractively, resist sex under whatever claim, then suddenly demand it in forceful ways. You can see this exact same behavior in people trying to quit cigs or drinking. She is weaning herself off of you, goes as long as she can, then must have the fix. Eventually she can go cold turkey.
6. They become exposed to greater wealth or social status in one way or another, either a new job, a wealthy wedding, a party with celebrities, anything in their lives that persists in putting them among a higher socioeconomic element than you are. You can have a perfect relationship. literally perfect, and this factor alone will create a breakup. Sometimes it's as vulgar as her breaking up a very good multi year relationship based on a tiny chance of hooking a big fish. Be very careful when your woman's life changes such that she is regularly exposed to wealthy people... unless you yourself are wealthy.
Those are the main ones I've experienced over many years and many relationships, but caveat emptor, I don't really do the monogamous relationship thing any more, haven't for some time, and advise against such after you have attained some level of mastery over your sex life and ability to get sex from different women when you want. IMO, monogamous relationships with women in the US are such a bad, biased deal for the man that they should be avoided. YMMV of course. None of them are "new" or any kind of Eureka realization. Others can surely add more to this list.