HI op, I work in marketing, and run digital ad campaigns every day.
In answer to your question no, this is not evidence. When I place ads for my brand I create a target group which could be eg women aged 25-35 who have a degree, work and don’t have children. Or it could be for 72 year old men who went to Spain in the last 12 months. Whatever Victoria’s secrets target group is for this campaign, you fit into it.
Retargeting is also a commonly used method of advertising, whereby a retailer will show you products you previously browsed on their site elsewhere around the internet, but this is done by placing a cookie on your computer, so not across different machines.
I hope that helps answer that question. However I agree with the others, leave now! I split from my DH earlier this year and we are now in the middle of divorce. We have children, it’s hard, I frequently feel guilty and I totally empathise with your wish not to be cruel, you just have to keep reminding yourself that he is the protagonist here, not you. He made the split happen by having an affair, you are now just following the steps required to finish off what he started.