Should I Have Walked Away After Fucking Her

When I met my wife to be, she was beautiful, blonde and she gave me the eye.
She agreed to a date, and ended up marrying her.
Many years later I met a guy who I hadn’t seen for years.
We chatted and I told him I was married, he asked who and when I told him her name he smiled and I asked him why he was smiling... he didn’t want to say anything , but I insisted and eventually he told me about her!
Before me she had put it about, several local guys had had her.
He said he had also enjoyed her!
Apparently when I met her, she was being fucked by two guys.
Both were calling round at her place and having sex with her on a regular basis.
Maybe I should have got my end away( I did on the second date) and walked away like obviously all her other lovers did once they had her !
He said he alone knew of at least 8 that she had been to bed with