For Female: Take your male partner's or husband's cloth or handkerchief and fold with 27 white or gray chenna(uncooked).
Stitch the cloth and keep inside in your pillow(you only has to use that pillow)
and stitch the pillow.
Sleep with the pillow up to 27 days(keep your head only not under leg or arm).
Remove the cloth stitched with chenna after 27 days, keep that in between your palm and pray the Gurugraha to get back the person and stay with you (108 times. no special mantra required).
Leave the cloth with the chenna in a river or sea (not in a well or lake).
You will be happy in 90 days.
For Male: Pray the statue of dual snakes in Shiva temple for 90 days continuously to get back your female partner with in that 90 days.