I am trying to create a relationship class between a feature class and a non-spatial table so that when I create a new feature in the feature class a new entry in the table is created automatically. I can make a relationship class between the two but the table only seems to be affected when I delete a feature and does nothing when I create a new one. Am I missing something here or is this not a function of the relationship class?
I presume its a geodatabase table (non spatial) and not excel from your description. Could you tell what is the cardinality of RC (1-1, M-M)?
You'll have to customize to achieve to achieve this functionality. Refer ArcGIS Help (10.2, 10.2.1, and 10.2.2) .
If your feature class and destination table are in Enterprise Geodatabase, then easiest option would be using insert trigger on your source feature class to create records in your destination table.