I think MDMA could end up fulfilling the role of a good therapist. Sometimes people have accumulated grudges or built up resentment due to lack of adequate communication or some past transgression that the other is unable to forgive. MDMA can open up these channels and if done properly, it could actually do some permanent good if you manage to have honest communication about it. Ideally you'd take MDMA with a licensed therapist to guide you but we're not there yet as a society unfortunately. When MDMA was popularized by Shulgin, it was making the rounds for therapists who considered it the most significant step forward in therapy they'd ever seen, for its ability to facilitate emotional opening, basically shortcutting through many difficult therapy sessions that were previously necessary to get to a place where issues could even be addressed. On the other hand, if the problems are due to personality conflicts, it's unlikely to accomplish anything as the match is probably just not right (my ex-wife and I were like this, got together really young and grew apart and were never really that compatible to begin with, we just tried to convince ourselves we were).