1)it was consensual relationship . both your brother and his girl friend were educated and they had physical relationship on their free will

2) i presume your brother did not have sex with girl under promise of marriage

3) your brother cannot be forced to marry the girl

4)in case girl friend files case of rape against your brother under section 376 of IPC your brother should obtain Anticpatory bail from sessions court

5) case would not stand judicial scrutiny

6) if girl is harassing your brother file police complaint under section 506 of IPC for criminal intimidation

7) rely upon messages received from girl threateneing to commit suicide

1. Not performing of marriage even after years of courtship is not a crime in itself.

2. However sometimes the vindictive girls do file false cases of cheating or rape if sex is done on promise of marriage.

3. i am not certain whether in your case such possibility is there or not but if the girl so wants she mat take her vengeance.

Hence resolve the dispute diplomatically and certainly amicably.

Was their relationship physical too and was there a promise to marry her during the physical relationship?

If there as a consensual sex between them with a promise to marry her then she may lodge a criminal complaint agaisnt yor brother under section 417 IPC, but she has to prove it by undergoing medical examination.

Their suicidal dramas do not have to entertained, let them make any hue and cry, do not be moved by it.

If their tortures are intolerable you may ask your brother to lodge a police complaint against them for forcing him or threatening him.

1. What case they can file against you? What have you done against them? Refusing to marry is not an offence to complaint about? What will be her prayer in the said case to be filed? To direct your brother to marry her? No court has jurisdiction to force any body to marry some one whom he/she does not want to marry.

2. She can lodge a police complaint alleging that your brother have had physical relationship with her by promising her marriage which he is now refusing and in some cases, the Court has held it as equivalent to rape. Some courts also have refused to term it as rape and considered it as having consensual s*x. If she can not prove that your brother had s*xual relationship with her then this rape charge also can not be leveled against him.

3.If anybody threatens your brother that she will commit suicide if he does not marry her then it will amount to blackmailing him which is illegal.

4. Collect evidence of their such threats given by audio/video recording the said threats and lodge a police complaint thereafter against them for giving you the said threats.

5. If police refuse to act, you can file a writ petition before the High Court against plice inaction.

6. Engage a local lawyer having expertise in this field to handle the matters promptly.