1. Ankul may try to do suicide or false suicide, He had previously threatened
Even he commits suicide hell will not fall on your head. Just dont be bothered about his such frolics. Ignore and kep distance.
2. Ankul may try to meet her personally, which can lead to physical violence
As herto avoid meeting him or to be cautious when he still forces his entry into her place by immediately gathering public or friend at that place to make him understand that she is no more alone in the world.
3. Ankul's thinks me as an enemy(as I am the cause of the separation) , he may try to disturb me or do some physical violence
If you apprehend such a situation, you may also be cautious about it in the manner you may choose to defend you.
When he told me my salary is equivalent to his black income (as a JEE) , I offended him saying " Then why your parents asking for Dowry, you don't gave them proper money"
Next time onwards do not respond to his cheap attitude.