She wants to drag you down to her own self hating level.
Subconsciously she cannot understand why you would actually want her.
Women manifest the signs of insecurity in slightly different ways to men. For us guys it's more about the fear of her cheating or leaving.
Perhaps it's time to acknowledge that the relationship is toxic and move on.
Something like you talking to an attractive woman will set off her jealous reaction.
She will get jealous not only if you talk to other women but even if you so much as look at them.
She will want to know where you are who you are with at all times.
It will begin subtlely and will creep up on you slowly.
But highly emotional irrational jealousy is something to be concerned about.