Maybe you want to side with women, because you think it gives you brownie points with them. Unfortunately, a woman is NEVER on a man's side. Simply put, they think totally different from men. Women have different brains. For a woman, a man is simply a means to an end. Maybe you are young, maybe you think you are special, and maybe you want to believe in them. Unfortunately, if a man's relationship ever conflicts with her self-interest, she will betray you too.
Now you say 'Not all women are like that', and maybe there is a bit of variation, but their nature is basically all the same. I honestly think it has to do with the XX chromosome. It's like none of them differentiate or expand into adulthood, like men do. It's almost like they contract instead. I'm not complaining about it. It's just evolutionary forces at work, and being childlike is actually advantageous if you are raising them. However, given the current framework, where relationships are based on love and equality, getting involved with them is a bad idea, because a man can sacrifice his whole life for her, only to find out that she didn't really love him, despite repeatedly saying so otherwise. You find out the whole thing was just an act.
You'd be surprised at how easy it is for a woman to move on from a relationship, completely cutting all contact off and never looking back, even if a man has invested his emotions or financial resources in her for years. Don't say I didn't warn you. You can feel like she took a part of you that you will never get back. This is the point at which men become bitter and indifferent to them.