She sounds an absolute NIGHTMARE!! To sit with your partner and say crap like she did is evidence of her inflated ego and belief that she deserves a rich handsome chap (rich enough not to work so he has time to dream about her all day) while funding her fantasy lifestyle ..

Hopefully your just over analysing mistakes she's accused you of making like I'm at that stage now it's just going through the motions of break up. Now I left my whole life a month ago moving hundreds of miles to get away from a narcissist control freak who made our life absolutely hell things you've mentioned ~ getting mad (not one single person can ever say they've never been angry!) being immature is her perception if you saw how silly I am with my kids at time you'd think I was insane never mind immature.. Points like that are just criticisms that serve only to aid her feelings of grandiose over you and you will see soon how better you feel being away from her!

Try joining (I'm Welsh so things might not work the same your side of the world ,) but things like trying new hobby, taking up a free evening class or online one, joining a pub pool league / darts team make your social circle wider.. Give it time your confidence will grow and you'll feel at ease with everything. I am coming out of the rose tinted view which suggests I was a insane liar and I'm in fact the abuser he's the victims and I've messed it all up its a disaster but pining for what I had just encouraged that line of thought and I recognise that in your tone x