First of record all her threats and menace creating by her, that will be valid proof of her cruelty.

Without evidence divorce may not grant and more particularly record her suicide threats, valid proof of cruelty and ground of divorce.

1. Let your friend convince his spouse to agree for Mutual Consent Divorce. Better to  opt Mutual consent divorce route and mutually the husband and wife can take decisions in the matter of child custody, finance, assets, maintenance or alimony, returning the jewellery given by  your parents and relatives etc.

2. In the joint petition to be filed by both husband and wife for dissolution of their marriage U/S. 13-B of the Hindu Marriage Act (Mutual consent divorce) , the custody of child, maintenance, finances, property matters, visitation rights will be mentioned.

3. The reason can be mentioned as due to irreconcilable differences they have been living separately since one year, and their marriage has broken down irretrievably and efforts to bring about reconciliation have also failed.

4. The time for concluding mutual consent divorce will be 6 months and this cooling period of 6 months can also be waived off in certain cases.

Dear Sir,

Attempt to suicide is also an offense if she commits such offense in future then simple hand over her to the police and ask them to book a case. Even now on her threats of black  mailings and your recordings police can book a case. Just threaten her through police.

I can completely understand the stress and trauma that you are undergoing. It appears that she is mentally upset over breaking up with you and feels emotionally insecure and vulnerable. At first, you should consider taking her for psychiatric treatment. At the same time, in order to protect yourself and your family I think you should consider filing a complaint with the local police authorities. You should also consider informing the State and the National Commission for Women that you are going through this. This preemptive action may protect you from suffering any harm in the future in case she takes any step.

- Be alert , If his wife even try to commit suicide or after doing so, she leaves a suicide note, your friend could be booked by the police under Section 306 IPC for abetting her to commit suicide.

- Further, if she does not leave any note but her family and friends in their statement give your friends name as the cause of her suicide then also he will be booked under the same provison of law.

- Hence, firstly , he should give an information Application/Complaint to the SHO of your area police station , after narrating that he is facing hardship as his wife is having suicidal tendencies and further he should not be held responsible in case such a thing happens.

- Further, Inform the same to her parents and also to make her attend counseling.

- Regular Threats to Commit Suicide Amounts to Cruelty and is also a ground for Divorce.

File for divorce on grounds of mental cruelty 

2) wife threatening to commit suicide amounts to mental cruelty 

3) wife abusing husband amounts to mental cruelty 

4) also file police complaint regarding wife constant threats to commit suicide 

She suffers from borderline personality disorder. I have handled such kind of cases. She will never stop till she destroys his life and family and his business.

File for divorce immediately on grounds of insanity and cruelty.

Also if possible rake her to her parents' house and leave her there.

Regards 

He can file contested divorce against her. It's a only option

Your friend can file for divorce under cruelty, before doing so, have substantial material proofs about her behaviour.

Dear Sir,

You friend may silently start to collect enough evidence to demonstrate before the court  that her activities part of "cruelty". For this purpose he may instigate her and get video recorded such behaviors for getting divorce easily because normally courts do no all divorce petitions filed by husbands.

Please try to approach counselling / mediation centre and explain them this facts and they will arrange for the sitting of both the couples and try to resolve the issue amicably if it does not resolve then you  can file a divorce petition!!

First let him convince her and take her to psychiatrist.

Let him ascertain the nature of illness,  if it is incurable then he should talk to her parents about this and get her admitted to a mental asylum, but if it is curable then he can leave her in her parents' house and get her treated.

If the above are not possible then he may decide to file a contested divorce case on the grounds of cruelty.

However given her adamant and weird nature of behavior, he may find it difficult to cope up with the situation including divorce case, let him consult a local advocate and proceed on the advises received.

See firstly your friend has to file a police complaint for intimidation on suicide and false cases by wife.

Further friend can file a divorce on ground of cruelty agaisnt his wife ,even she is staying in his house he can file divorce and can record any harrasment and intimidation from her.

1. In this scenario the only thing your friend can do is to file a petition for dissolution of marriage on the ground of cruelty against his spouse.

2. His wife may file 498A and DV cases against him and his family members.

your friend can file a petition for divorce on the ground of mental cruelty, as far as law threatening to commit suicide is also amount to cruelty . 

Since wife in not in favour of divorce, mutual consent divorce isn't possible in your friend's case. Your friend will have to contest a divorce case against his wife. He may seek divorce on the ground of mental cruelty. 

Your friend should install hidden cameras in common areas of house to collect evidences that his wife is creating mental trauma to him and also abuse him physically.

And he should file divorce on ground of mental and physical cruelty against his wife.

If possible he should take her to some psychiatric and get report of her mental health so that his case can become more strong.