Steps to take if you are fearful of a jealous person

Recite the last two chapters of the Qur’an, remember Allah, and supplicate to Him:

And from the evil of the envier when he envies. (Qur’an 113: 5)

Hide or keep secret your affairs from the jealous person:

‘O’ my sons! Do not enter by one gate, but enter by different gates… (Qur’an 12: 67)

Be generous to a person who attempts to harm you, for perhaps he will then desist:
Repel evil with that which is better. (Qur’an 23: 96)