“ The expression 'cruelty' has not been defined in the Act. Cruelty can be physical or mental. Cruelty which is a ground for dissolution of marriage may be defined as willful and unjustifiable conduct of such character as to cause danger to life, limb or health, bodily or mental, or as to give rise to a reasonable apprehension of such a danger. The question of mental cruelty has to be considered in the light of the norms of marital ties of the particular society to which the parties belong, their social values, status, environment in which they live. Cruelty, as noted above, includes mental cruelty, which falls within the purview of a matrimonial wrong. Cruelty need not be physical. If from the conduct of his spouse same is established and/or an inference can be legitimately drawn that the treatment of the spouse is such that it causes an apprehension in the mind of the other spouse, about his or her mental welfare then this conduct amounts to cruelty. In delicate human relationship like matrimony, one has to see the probabilities of the case. The concept, a proof beyond the shadow of doubt, is to be applied to criminal trials and not to civil matters and certainly not to matters of such delicate personal relationship as those of husband and wife. Therefore, one has to see what are the probabilities in a case and legal cruelty has to be found out, not merely as a matter of fact, but as the effect on
