I told my boyfriend i used to self harm and his response is concerning me?

So the other night I was talking with my boyfriend that I've been dating for almost two years now and the topic of self harm came up. I never told my boyfriend but awhile ago, before I dated him, I was in a rough place and I used to self harm. I haven't in a long time and I finally felt comfortable enough with him to share this. I wasn't sure what to expect as a reaction because he can be quite close minded at times but I was completely taken aback by his response. After I told him, he stared me down and said "anyone who does that serves no purpose in this world and doesn't deserve to live." I don't think he was trying to be hurtful in any way but the way he said it and looked at me while he was saying just sort of made me feel like he was telling me that I serve no purpose and don't deserve to live. He said it was really stupid and if I ever did it again he'd break up with me because self harming can lead to suicide. I love this guy alot but I've never seen him act like that before. I just don't know how to take it knowing that he would judge me or someone's worth solely off of something like that. I'm really confused and a little hurt. If anyone could help me try to figure this out it'd be greatly appreciated! Thank you :)