OP. There is one thing I can tell you for sure.
The ex left you, she cheated on you and treated you like you never ever existed. That's normal... It has happened to everyone, not only in this forum, everyone in the world. Some take the punches better then others. (I know I'm hurting, and lost, and crying... But hey, that's just me

)
If right now, when you are heartbroken, you try to figure and understand the true nature of women, you will only get bitter, resenteful and downright misogynist.
You will know a lot about women behaviour, but at the end of the day, you will be jerking off in your room. There is no use in trying to get the full picture right now. You will be a master psycotheraphist at best. 'Cause knowing that kind of sh*t WILL NOT GET YOU LAID! Not right now at least
Right now you should focus on yourself, understand the rules of the game and play it. When you are at decent level you go deep down in women psychology, so you can get the full picture and use it on your behalf. Just accept how things are, and use it in your favor that they are so easily influenciable.
Do that and be on the other end of the rope the next time around, be the guy f**king other dude's chick, or dump'em by the snap of a finger... Just don't feed this hate. I've feed it a tiny bit, and it became a monster. The only medicine is to go out there, and meet other chicks. They don't know you, some will be bit*hy, some you be very nice. Snap out of this virtual world for a while.
Now, on the other hand, if you want to became MRA, or MGTOW, that's the way to go. Just hate them for the animals they are and live a happy life without them...
That's not part of my plan, I can tell you that.