Welcome to forum.
Have you discussed your depressive thoughts with your GYN or PCP?
Here is a link from the Mayo clinic on the Depo shot. Before you blame your relationship on your feelings please review this carefully, talk to your doctors. When you are depressed, a relationship can be very hard to handle. The best thing to do in most cases is to communicate with your spouse.
www.mayoclinic.org/tests-procedures/depo-provera/basics/risks/prc-20013801Peace
Trina