Should I tell him?

I've been with my partner for 3 years now, we live together and have a beautiful little boy but some thing has been eating away at me since we met.
 I used to be a cam girl.
Like someone who strips on webcam for strangers sort of thing. I did it to help me financially get through my first year at college. TBH it was great! I didn't mind showing off my body (not that my body looks like that now😂), I was single at the time and I could make £300 a day.
I don't know if I should tell him as it was a year before we met, I genuinely don't think he'd believe me and I have absolutely no proof or trace that I ever did it ( I deleted EVERYTHING when I stopped)
Should I tell him about it or does it really matter now?

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