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.
I recommend you create one. Your situation is not going to be the same as someone else's. If you create the spell yourself it will speak to exactly what is going on for you. If you don't know how to create a spell, in my opinion, you shouldn't be casting.
However, you can find several cleansing spells on this site and the internet. Find one that is close to what you are looking for and use it.