Nobody accidentally leaves a bad situation. At some point you have to choose to walk.

Bad situations do not usually end on their own. They tend to hold their shape, and the hope that something outside will interrupt them can keep you waiting a long time. Leaving takes a decision made on an ordinary day, often without a dramatic final straw and often before you feel ready.

If part of you already knows, start with the smallest real step rather than the whole exit. Find out what leaving would actually require, write it down, and tell one person you trust that you are looking at it.