Do I tell future partners

I had an abortion when I was 18. I wasn’t ready and the person I was with was mentally and physically abusive and we fought constantly. I am now in a serious relationship with an amazing man. I don’t even have the words to describe him he’s too sweet.

Do I tell about my past abortion? Personally I don’t think it’s gonna make any difference to tell or not tell. What are your thoughts on it? Under what circumstances should I even need to tell. I don’t care if he knows either way I just not sure what the norm is.