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The answer is simple, but one you don't want to hear: they don't respect you as a man.
Women want a man to be a leader. That doesn't mean she wants him to be controlling. A leader, in the most noble sense of the word. When a man achieves that, women melt.
But being a leader sometimes **seems** contradictory. Because it means you have to be assertive. Sometimes you have to say "no" to what she wants and stick to your guns, even if she throws a tantrum and starts arguing (DON'T back down from a fight). Your decision making won't always be popular.
But women want and desire a man who won't let her get away with throwing tantrums. Someone who demands the best from her at all times. She wants a man. Not a limp noodle. Not a pushover. Someone who does what he wants without apology... but who also takes care of her emotional well being, her needs, and desires.
You aren't satisfying that role. Clear as day to me, based upon your comment.
When women are dissatisfied, they rarely outright tell you what's wrong. They'll hint. They'll imply. And if you keep "not getting it," they'll eventually argue, throw a tantrum, lose attraction for you, and seek out a stronger man.
Your lack of leadership makes them feel restless. Unnerved. Maybe (often, actually) she won't be able to articulate what's wrong... so she'll argue about petty shit. That's your opportunity to reassure her that you're a strong man -- by shutting down her Bullshit. She WANTS you to win the argument so that she's sure she isn't dating a weak chump.
Anyway, you get the point.
Long and short of it: grow a fucking spine, have a sense of direction, be decisive, and stand your ground.