No need to bow down to pressure tactics 

2) you had consensual sex  with her with no promise of marriage 

3) if girl threatens to commit suicide file NC with local police station regarding her threats 

1) Kindly visit to nearest police station and complaint against her regarding attempt to suicide. And she is harassing and threatening to you marry with her. And had forcefully physically relationship with you 3 years ago.

1. After passing of 3 years the allegations of rape is unlikely to stand.

2. Now as regards suicide , it can be said that a person who is suicidal hardly gives early warning.

3. Severe all communications with her, change your mobile number and if possible change your address as well.

4. I ay event inform the police in writing about sch threats.

Hello,

You should lodge a GD for intimidating you , that would be sufficient for now. 

Regards.

1.Live in relationship is not the obligation or binding between the parties, it is by choice and free will. 

2.Your Girl Friend can not forced you to maintain that live-in relationship.
As she is threatening you for committing suicide is itself an offence, an legal action can be taken against her.

3.file a police complaint and also send a letter to her parents and tell about her suicide tendency. 

Sir,

First of all you dont try to entertain on phone .Meet at a public place and tell her clearly that if she gives such threats surely you shall make a police complaint.

Sex with mutual consent for adults is not considered as rape in various judgments, so your matter can be well contested.

See file a police complaint for intimidation and threat for suicide . The police on complaint shall take steps.

You need not worry, as long as the physical relationship in between you two was consensual. You both were adults at the relevant time of happening of this episode and were well aware of the repercussions of this consensual act.

No need to worry,you can engage a lawyer who can handle your case very easily without hassle you. You can engage senior lawyers from this portal website.

Hire a lawyer from here to draft the GD and ask the police to register the same.

Regards.

First try to save yourself and then think of your family.

You can relax as no prima facie case can be made out against you, as the physical relationship between you and the girl was consented. 

Also, no complaint can be made by her after 3 years as no medical evidence can be produced after such a long time.

You can file a NCR with the police that the girl is threatening you to commit suicide and trying to blackmail you and ask them to investigate and take action for the same.

This can be used as evidence in court, if the girl goes on to file a complaint against you in future.

You can file a complaint with the police, without your parents knowing as you are a major and can exercise your legal rights, without anyone's consent.

Physical relationship between two adults can not be later termed as rape or physical abuse

You may go to the nearest police station and lodge a NC so that if some step is taken by her in future then you have some defense to take.

Regards

When you file police complaint your family will not come to know of same. On complaint police will not inform your parents.

You can file NC with local police station regarding girl constant threats to commit suicide 

2) your parents would not come to know 

1) You can hire a lawyer who will guide you further who is expert in all these thing. Who has good knowledge of local police station of your area.

as per legal, you had sex before 3 years means, now she can not prove anything medically. You just dont even discuss with anyone like you had intercourse at all.

Just ignore her calls, do not communicate with her. You can file a police complaint provided she dosent have any proof of your relationship, under blackmailing to take money etc..

.

Dear Sir,

The following information may kindly be read.

Criminal Intimidation

When one threatens another with an injury to reputation, with the intent to cause alarm to that person and forces him to do what he is legally not bound to do, this is called criminal intimidation.

It is a threat to harm reputation, property or the person himself and cause of action of these threats are often unlawful.

• When a girlfriend or wife threatens to commit suicide, in such cases, a case of Criminal Intimidation can be filed.
• In the case of marriages, a false threat to file divorce cases or 498Acomes from either the wife or from her family members while wife often threatens her in-laws of committing suicide. This amounts to criminal intimidation.

What To Do With Such Threats

• If your partner leaves a suicide note, you could be booked by the police under section 306 IPC for abetting her to commit suicide.

On the other hand, if she does not leave any note but her family and friends in their statement give your name as the cause of your partner’s suicide then also you will be in trouble.

• According to various case examinations, all girls who threaten their husband or boyfriend of suicide never commit it. It is advised to visit, police station and speakto the station officer or inspector about it.
• Inform local SHO of the police stationand inform him through an application stating that this girl is having suicidal tendencies and you should not be held responsible in case such a thing happens. Inform the same to her parents and also to make her attend counseling.

Steps of Cautions To be Taken When Your Wife or Girlfriend Threatens to Commit Suicide

• Do Not Fight
• Do Not Give in To Threats
• 
  Take Decisions to Save Yourself

You should not be the first one to approach the Police.

This could complicate the matter.

Just try to avoid her. 

You may first issue a legal notice to her to refrain from indulging in such threatening activities or else to face law in this regard.

After that you can even lodge a criminal complaint against her with the local police for her  suicidal threats 

In retaliation she may file a complaint under section 417 IPC for cheating her on the false promise of marriage.

You may obtain AB and challenge her false case in the trial proceedings.

You can request the police to not to reveal this complaint in public especially to your parents.

The police may cooperate with you in this regard.

You may take the assistance of your advocate to tackle this.

If she is threatening file a police Complaint.