i spose ppl say, if its mdma its mdma.. but like im sure things that test up as mdma can be something similar to mdma which doesnt give u the same effect exactly, im no good when it comes to the make up of these chemicals, but like im sure theres some other close sister to mdma that gives u the same kind of effects minus the lovey-ness.. or maybe im not prone to that lovey feeling any mre...
Well, the only things that show up on an EZ test as black are substances with a methylenedioxy group on it (the "MD" part of MDMA), so the choices of what it could be is quite limited. Also, there really isn't a market for the chemicals that are used to make anything else other than MDMA (or MDA, and even rarely MDEA). So, I doubt that it'd be anything but some MDXX substance.
What's probably happened is either its MDA, which is known to give you the "charge" without the "love" or you've just done it so much you've lost the "magic" of it. I've seen it happen to a few friends of mine. On the same pill I was loved up like a mofo, and they were just smacked out.