Are you certain it was a hex? could it possibly be that a bad decision was made and now the consequences are appearing?
If you are certain it was a hex, cleanse yourself. Breaking a hex takes concentration and will, you will need to work a cleansing on yourself and be focused on the cleansing taking away the hex. This will not make your relationship come back. It will only free you from the spell cast on you.
I will tell you, in my experience breakup hex spells don't work unless there was a break in the relationship to begin with.