It makes sense to me when punctuated like this: It's not that I was jealous of you, that I acted like that [being jealous] the other day. The reader expects a remark like this to be followed by an explanation of what, if not jealousy, my actions were the other day, such as-- It's not that I was jealous of you, that I acted like that the other day. It was my just my inability to deal with my own sense of worthlessness.
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