I hope no-one here minds but I cant really agree with much of the advice here. I'm sure its more sensible than what I'm about to say, but just for the record, heres my take.
MDMA doesn't create something out of nothing. It places what you have into overdrive for a while, with a very stiff comedown regime, hence your feeling down. Life and its pleasures are so short and fleeting. If you have the opportunity I would get in contact and see what happens. If he's up for it and you are too then go see him and fuck like rabbits. Then do it again. If you like still like it, and he's up for it to, try experimenting with other substances too and see where it goes. I'd recommend a hit of mdma then one of these trippy phenylethylamines like 2C-B or 25C. Then spend the entire night cuddling, fucking, and just generally exploring the limits of human sensuality.
Enjoy it while you can.