Is "Fake it 'til you make it" an acceptable Buddhist behavior?

Does Buddhist psychology view the concept of "fake it 'til you make it" as an acceptable social behavior (eg, cheerful behavior rather than stressed behavior, or calm behavior rather than emotional behavior)? For example, I recently attended my first meditation retreat (a weekend event). I was overcome with emotion a couple of times during meditation practice and teaching sessions, with quiet tearfulness. Also, during the sharing time, at the end of the retreat on the final day, I wept as I finished my expressions of gratitude to the teacher and group. Should I have restrained that last public display of emotion? Was that display of emotion an ill-timed expression of ego/self, and, therefore, according to Buddhism, best to be avoided?