I think women are so conniving
Why do you think women are conniving?
Women always tend to backstab each other when they're competing with each other. They also try to steal each others men.
That may be your experience with women but it's definitely not all of them.  You shouldn't let your experience with a few bad apples taint your view of all the others. Try to remain neutral until you get to know someone.
I'm still mad about my experience and can't trust anyone anymore.
Making such generalizations will leave you feeling alone in life. I understand you feel betrayed, but you should try to let some women in your life in the future. Keep your guard up but don't assume the worst.