Well, guess what. 'Bad' relationships are the most common and I'm not sure if there's anyone who hasn't been in one. But they serve an important purpose. They teach us what we DON'T want.
So clinging to it as anything more than a 'lesson' is really just being self indulgent. It's like carrying that stone on your back into the future. So in reality you are STILL in that same bad relationship.
Not many people will have high tolerance for that. Sorry.
I suggest you take the lesson, drop the stone, and build something new & better