Promise of Divorce can be seen in one’s horoscope by these parameters

1. Houses which is to be taken into consideration for assessing divorce possibilities are 1st, 2nd, 4th, 6th, 7th, 8th, 11th and 12th in individual horoscope.
2. Planets which are posited in these house and their lords play significant role in determining tough or hard period in relationship. 
3. Any cruel malefic effect on these houses, lords or over planets placed here disturbs the harmony.
4.  Key planets should be seen is Mars, Saturn, Sun and Rahu