Ravi (35), a street vendor, was allegedly attacked at his girlfriend's house in outer Delhi's Mangolpuri last week, where he was called by her relative, police said.
After attacking him, the woman fled along with her brother and sister-in-law.
Her brother and sister-in-law were apprehended on Saturday and questioned, during which it was revealed that the woman had fled to Punjab after the incident and stayed at gurdwaras there.
During questioning, the accused told police that Ravi had started avoiding her and had snapped all ties with her.
More From This Section
She also claimed that he did not trust her and accused her of being in touch with other men.
The woman was enraged at his indifferent behaviour and on the day of the incident, she had called him to clear things out, police said.
When Ravi reached her home, she broached the topic of marriage. However, Ravi refused, saying his family was against it.
Enraged at his refusal, the accused chopped off the man's genitals with a kitchen knife.
The victim said the woman's brother and sister-in-law were present at the house when the incident took place and alleged that they did nothing to stop the woman from attacking him.
After the attack, Ravi rushed out of the house shouting for help. Some neighbours informed the police and rushed him to hospital. After a surgery, he was referred to the Jaipur Golden Hospital.