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Ex GF wants to give us another shot and I'm having very mixed feelings about it
Posts
You say that you don't trust her, but your actions indicate that you want to trust her, despite your knowing that it's problematic to continue this. Something that may be helpful is for you to list the reasons WHY you want to trust her, why you WANT to keep talking to her. Presumably there is more to it than just "she's a good fuck, and I'm too introverted to find another good fuck."
I sometimes find it beneficial to list the reasons why I want to continue to do something, and then reflect upon that list of reasons. Over time, you may be able to disconnect yourself from the list, and view it objectively. So, after a few weeks, you start to think, "Hmm...this appears to be a list constructed by an emotionally damaged weak-willed crazy person.....oh shit....I'm the one who made the list." That realization can prompt you to change, since you realize you're acting in a way that is contrary to how you think a reasonable person ought to act.
You don't have to share the list on the forums, but I would encourage you to make it, and read it every other day.