I had a similar situation. The only time I took half a pill out of curiosity, and I suddenly opened up with everyone around. It was during a time that I was quite grumpy and would often drink heavily, and didn't know how to deal with my feelings.

I felt this odd urge to express myself towards everyone around me and was being very wholesome about it. I was aware that this was odd behavior for me, but I liked it and it felt like I was "letting go".

I noticed what I was feeling and how I was expressing myself and that it was ok. That was enough validation for me to keep on without taking mdma.

This happened just the once. I haven't felt the need to try it out more since then.