Worried about judgement

So I’ve struggled with self harm in the past and I have some scars from it. My last bf knew about this and didn’t judge me about my scars because he had also been dealing with depression and self harm. Well we broke up because of distance and other things. It’s been a while and I am with a new guy that has no idea about my past problems. I am afraid that if we get really serious that he will see them and freak out or something. plz comment any advice on how to handle it