Moment of madness with older man not worth pursuing

I was very attracted to the father in the house but kept my feelings to myself. One afternoon when his wife and children were away, he came into my room and started kissing and fondling me. Though I was thrilled with the attention, I told him he had to stop. Afterwards we pretended that nothing had happened though I was constantly fantasising about him.
I’ve been in touch on and off with his wife since leaving four years ago and have just heard they have split up. I am torn between letting him get on with his life and sending an email to say I still feel deeply for him.