Should I tell his wife?

Just found out the guy I hooked up with (three times) 9 years ago is married and has actually been married for 10 years! He didn’t have social media but I came across his picture on his wife’s social media celebrating their 10th year anniversary. That means that when we hooked up he was already married for a year… I don’t have any proof or texts because I no longer have my old phone/old number. I also saw that they have 2 daughters together. On one hand I feel obligated to tell her but I also don’t want to ruin a seemingly happy family and break their daughters’ heart… Should I just leave it alone then?

(We have since gone no contact ever since the last time we hooked up, it was all very casual and I’ve forgotten about him plus I’ve been in a happy relationship ever since then. That is up until he popped up on social media and caught me off guard - my boyfriend knows about all this and told me to stay out of it).

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Should I tell his wife?
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