You have right to maintenance though desertion need to be analysed .It is domestic as well social issue and at this time act wisely and smoothly to protect the matrimonail relationship. You have to decide about it as this could lead a future trouble too,it is better to know what actually your husband is thinking.
Ligally you have options but that irks consequiences.
You can file application for maintenance and the court can grant you monthly maintenance . You have too look for the future of your relatiuon with your husabdn,that may not get effected or how that is going work as just for purchasing a mangal Sutra should not be reason for seserting you.