jalandhar was a clone of lord shiva he was invincible. narad tells him to marry parvati to instigate him and like a fool he sends a proposal to shiv to leave parvati angering shiva who fights him since he cudn't defeat shiva he thinks if shakti marries him then shiv would loose his better half so to trick parvati he goes to her but after creating a atmosphere of music and all making shiva think he has given up
since parvati forgot shiv and jalandhar goes to her to trick her as he looks like shiva and at that instant she remembers shiva showing she is pativrata and curses jalandhar his end will be soon...she tells vishnuji to go to vrinda (tulsi) as jalandhar since he is her brother also the reason being tulsi was blessed that as long as she is faithful to her husband he won't die also in her previous life she was a gopi and wished vishnu (krishna) her husband and got blessed that it will be granted in next life hence when she burns herself due to the cheating vishnu marries her and tells her she will always be pure so pure that all evil illness will get cured becuuase of her.