Sec. 3. Dissolution of marriage shall be decreed upon a finding by a court of one (1) of the following grounds and no other
ground:
(1) Irretrievable breakdown of the marriage.
(2) The conviction of either of the parties, subsequent to the marriage, of a felony.
(3) Impotence, existing at the time of the marriage.
(4) Incurable insanity of either party for a period of at least two (2) years.