Don't Know What To Think/Do
 

Ok so I've liked this guy for quite some time, and I found out last night he likes me back. Which was wonderful because he's just the way I am, he's a cutter and we've helped each other through quite a bit.
Tonight I was over at his house playing videogames with him and my best friend, at one point he decided to start showing me all of his "tools" that he had, which right from the start kind of got to me, but I thought "Since we're both trying to stop, maybe this will help him.." My best friend is fully recovered at this point and supports me in everything, so she didn't mind much either. The last thing he showed me were two small blades that you pull out of a razor, my best friend was playing a game at the time, so it was pretty much just me and him. He was going on about how small and thin they were, and he ran one across my upper arm, and next thing I knew I was bleeding. I didn't even feel it, probably because I was shocked.
I know he didn't mean to, but then he tried to play it off and said "Ahh, I'm sorry! Well look at it this way, tonight I did it for you!" then he goes "Ok look, I'll do it to, and it's the same size and everything" At that point my best friend got up and walked out of the room. He tried to play it off like nothing happened...and I kept bleeding.
Luckily, it was time for us to go home, so we went upstairs and he got me a bandaide which he insisted on putting on. On the car ride home I didn't say a word and sat there ridgidly, I jumped out of the car when we got to my house and now I don't have any idea what I should do.
I know he's someone I can trust, or at least I think he is, I know it was an accident, but still....I can't tell any of our other friends what happened because they'd freak out.....what on earth do I do?

I can understand why it freaked you out, but it was an accident. And seeing the amount of talking it off he tried to do, he's probably really embarassed that it happened. I'd just try to blow it off if I were you. Showing you his tools was a way of showing you that he trusted you. Freaking out over an accident probably wouldn't make him that confident in his choice!

I find it kinda freaky.
It is one thing talking about it to someone but showing them 'tools'? And 'accidently' cutting your arm? Sorry but why was he holding it that close to have an accident?

I think you should find someone more 'stable' to talk to about this sort of thing. And make it clear to him that you are not cofortable with the situ.

Sorry if I sound harsh it just seems weird someone would do that.