Why is the majority of girls double minded and lie so much?

All girls I dealt with in the last year (since being single after a 3 year relationship) are telling lies about themselves , about you and about every other girl or guy you or she mentions. I know that pure girls still exist , but it seems like I haven't met them yet.

For example , they like to lie that some particular girls are h*es and f*ck with everyone, but they are always together with them. Whats more, they tell lies about how they dont like someone (dont find someone amusing or attractive) and than end up being friends (with other girls or boys) or f*uck them , but continue to criticise that particular person...

Even my ex started behaving all the ways she always told me not to behave. For example not to stay for so long outside in the club or not to be in some bad friend groups (which are connected to crime in their past etc) but I see her around in the worst groups possible.

What I am trying to say, 30 out of 30 girls I talked with told me so much lies that its not humane. Whether they were my female friends or my dates. My friends hare the same expirience too.

One girl that I went on 3 dates with 5 months ago, who hates her ex boyfriend is now pregnant with him. The other girl who hates her ex is still f*cking with him secretly. The third girl hates on that one guy but if he called her she would kill for him.

How I am supposed to trust any girl even on a friendly basis? Not to talk about finding a girl I would like to be in a love relationship with...

I am not perfect but if I tell something I mean it that way. If I say I hate someone , I mean it and I act like it. And most guys are like this (here in my city). Whats the purpose of lying , trying to comfort you , trying to tell you what you want to hear? How to deal with it and how to handle them?

Girls please dont take this post offensive but I want to know why is it like this, even if you are not like that, you have some friends that are like this 100%.
Why is the majority of girls double minded and lie so much?
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