There's a guy at the hospital I volunteer at that I've started

There's a guy at the hospital I volunteer at that I've started to fall for and get close to. I want to tell him that I used to cut and that I've been dealing with depression for 3 years. What would be an easy way to start the conversation? My scars aren't overly noticeable so it's not like I can "accidentally" let him see the scars. Thanks for your help Witty