I was naive with the interest rate on my credit card and have let it get out of control, it is unsettling to me.
Being in debt is so stressful and I'm sure that just adds to it. 
It does, and the worst of all is I'm scared to tell my partner about it.
I don't blame you. I have been in that position with a credit card I forgot to pay when we moved and they didn't have the correct forwarding address. Stress on top of stress. :(
How did you end up getting out from it?