That sounds sooo similar to my story, the first time I "really" rolled was with a girl I had been trying to get with for a while, and it didn't happen that night due to outside circumstances, and after she left and I came down (mind you these were meth/mdma rolls so the comedown was ROUGH) i just sat in the bathtub for an hour and cried.
It was like all hope in the world was gone and there was no happiness left to go, everything seemed very surreal. The most chemically drained feeling I've ever experienced. Smoke a lot of weed the next day and make sure to shove some food down your stomach, it helps out a lot with the day after crash.
And shit eventually worked out even, I've been dating the girl for almost two years now