I was a third party in a marriage. I have broken up. Should I tell the wife anonymously?

Anonymous
Long story
I was in a relationship with a married man (he has been with the wife since 2014) for 1 year.
- had access to his email for some reason
- saw that someone sent him nude photos - he brushed it off as spam
- dug a little and found out he was on dating sites, and also posted ads looking for sex in the past
- when questioned, he say he did not meet anyone in real life. And that all he did was chat online. Fine. Since it was way before we met.
- I found that he recently (Aug 2020) commented on a new sex ad. There was a email notification sent to him that someone replied his enquiry. He denied it saying that it was email spam

Is this what they call once a cheater always a cheater?
Should I let the wife know?
Yes
Vote A
No
Vote B
Select age and gender to cast your vote:
GirlGuy
I was a third party in a marriage. I have broken up. Should I tell the wife anonymously?
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