Why do women always change their mind based on their feelings at one moment then change itagain and againet?

because we are true to our feelings and respect our feelings enough to give them weight. We decide, feelings are important as they are usually right, intuition is the best guide. As happiness is an emotion the best way to get happiness is to make sure you follow your emotions and notice what things make you ahppy and what makes you unhappy.
Things are changing CONSTANTLY, and women have the talent of being able to keep track of and weigh the pros and cons of every single little change. So it is a response to changing developments. because the circumstances surrounding a decision changed, the decision changed as it is no longer the same decision. Depending on circumstance, the same situation could have a different opinion depending on what way you view it, and we can see all the sides of something. Women think twice, then think again.
Does that make sense?

We are indecisive. Simple as that.

Woman are naturally Bi polar because we always have hormonal changes... monthly periods, puberty, pregnancy and menopause. Just sit back and watch the show its for your entertainment lol and its not on purpose.

Because they can. No other explanation is needed or required.

Why does anyone change their mind? Because something has changed, either for them, or in the situation.

Dunno, part of being a woman and I cant put any better than what was written by SummerWind18 who I believe succinctly answered the question. It's about the only that is constant in life isn't it, Change?

Because we can.