Why is it so hard to get out of a marriage?

LepardLashes
I have been married for about 6 years and my husband doesn't make me happy, he's becoming more selfish, he has a lot of resentment towards me, to the point where it's mental abuse. I fell into a deep depression, because i started perceiving things the way he did for instance I would tell him a story and he would find something wrong with what the person said making it seem like i'm being attacked or i'm attacking someone else. Most of the time this is not the case. Everything is super negative and he has diagnosed reoccurring major depression disorder and anxiety. He's even in therapy and we did therapy together, nothing works.
Why is it so hard to get out of a marriage?
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