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TishaBuv it’s ok to vent frustrations. You are correct in that it’s important to figure out how certain things trigger you that are part of your history. Part of personal healing is in understanding self better and that can take time and patience.
The other thing to come to terms with is the fact that others may not have the ability to understand us like we want. That can be due to brain wiring, something I have had to work around in my 42 years of marriage.