I attract clingy guys, advice?

Hey-you
I attract nice/clingy guys like you wouldn't believe. The kind that proposes to you after two weeks together and then latches onto you after you dump them. I'm not even sure what I'm really doing wrong since I go for typical nice guys, they seem fine and confident when we start off, I am friendly and have fun and then from one day to another sh*t GETS SERIOUS. To be honest I am starting to understand why girls would go for jerks instead.
I attract clingy guys, advice?
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