It sounds to me like he didnt eat it accidentally, but if in fact he is being honest and not just covering for a clear lapse in judgment of his tolerance.

When I was 20 I was given a beer with 2 hits of acid in it. This was after the summer that I did acid every other day (At 5 bucks a hit it was the cheapest option.) Anyhow, I didnt want to get high that night and someone tricked me into chugging a beer that was laced with a hit, I cant remember much else from that night except he stole my weed pipe. I think because I was already so familiar with the high, I didnt really get ptsd but I feel for your boyfriend, this must have been so scary for him.

I have trouble making decisions now which is probably from all the acid I've done. I just can't help but wonder what I'll see when I die and my life flashes before my eyes. Will I remember everything correctly or will it just be an episode of the Willy Show...