What was the moment when it finally clicked for you that you and your ex weren't good for each other romantically?

It finally clicked for me that I deserve better. He wasn't a bad person but just didn't treat me the way I deserve to be treated and even after many months of trying my hardest to get back together, I didn't see that he was just stringing me along kind of without probably realizing it or maybe he was. But now I don't have anymore feelings romantically for him when I asked him a simple question. I won't say what it was but it was enough to make me realize that he is never going to see me that way again and I need to move on.

I'll still be his friend but seeing him again will probably be out of the question.

He ruined any feeling of hope with one answer.
What was the moment when it finally clicked for you that you and your ex weren't good for each other romantically?
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