I started a relationship three weeks ago. Two days ago, my anciety struck again, triggered by a casual remark about a past lover (this specific pattern of anxiety struck me before, when I started a ten-year relationship with somebody who had +/- 80 one night stands and could not stop bragging about it in the first half year)

She is willing to invest in this. I gave her a book called "De bange mens" (written by Daan Heerma Voss and translated as The Anxiety Project) that gave me some insight but I am interested in finding more books or other resources.

Or tips on how to handle this.