It's not letting go per se that is the problem, it is that deep inside you crave for people's contact. This is what I make out of your diagnosis. It's your fear that you'll never find a better person to be in relationship with. It's that you over-analyze the situation and the person and it can be what is called
analysis-paralysis. You believe that you feel safe with the person (who may be a friend or a romantic partner or a family member) even though you know it's a toxic relationship. It's normal for a person diagnosed with anxiety disorder to crave for people, I do that too. Ever since I was a little child.
I even dream about people long gone, those who don't have anything to do with me. It was just yesterday where I dreamed of a friend who I had sexual attraction to, it was a very heartbreaking dream. We were back to high school and during a class he sat next to me. Now it's been more than two years since I graduated high school, I am in college now, I cannot drive (due to my head injury) and he's there riding with bikes like
Classic 350. I am a loner while he's a popular handsome guy. I crave for him still, I dream about people like him daily. It's because of my anxiety and stress which trigger those dreams.
The best thing you can do is talk to your therapist about it. However it doesn't mean you cannot reduce and eventually erase the craving by
yourself. Here are some links to blog articles which can help you.
1)
10 Reasons Some People Just Can't Let Go of An Ex - Psychology Today.
2)
Why You Can't Let Go - Thoght Catalog
3)
40 Ways to Let Go and Feel Less Pain - Tinny Buddha.
4)
Important Tips on How to Let Go and Free Yourself - Psychology Today