Brit, going NC is tough... it was only possible for me due to the pain of contact that was only initiated by me.
Try to stay busy but busy with things that are for you. Things that make you a better person, that are healthy, that make you happy, or that you enjoy.
It helped me to list 5 positive things for myself each day. Like how you enjoyed the river and people having a picnic. Initially, it may be hard but count even the smallest positives! Slowly you will focus more on yourself and become more centered
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