obsessive thinking

I have been NC for three weeks this is probably my 20th attempt, and mean it this time. The problem is he keeps coming into my mind, but not for good reasons, i keep playing the bad things and the lies in my head and trying to make sense of them. Any tips on how to combat this and to fast forward the whole process.

Any tips would be welcomed.
thanks
sue

Moved from share yout story to; it's all about him forum
Goldie