I had a really close friend once that I let down the curtains for and everything went well for years. Then she reconnected with her mother, who disapproved of our friendship because she said that since we were so close and went everywhere together that folks would "think we were lesbians" and so my friend, trying to please her mother, dumped me! I was heart broken, as we had been super close for years. As time went on, however, she found out that her mother was a heartless person and that she had been mistaken. She wanted to re-friend me, but by that time I had moved 600 miles away. We are still Facebook friends, but other than that, I would never ever give her the chance to hurt me again! I would not allow her to get close to me again like that.
I have another friend now who calls me her "best friend" and who I occasionally call my best friend too. We are not as close as the other woman and I were, I will probably never ever let anyone get that close again. Instead, I go to the Local Senior Center and have many friends there. I don't let any of them get super close either. We just talk about our lives in general, none of the really sad stuff, mostly the happy stuff. I one time did mention my PTSD, but just briefly and I doubt anyone even remembers it. It was during a lecture on the subject by a visiting nurse that comes each month to tell us about various mental health issues. We have lectures regularly about all kinds of health issues and we learn stuff that way, which is good.
I visit one time a month or less now with my "best friend" and we have some things in common, including that we are both PTSD. We don't talk about that much, though we both have shared why we are PTSD in the past. We don't dwell on it though. Instead we go out to eat and talk about what is occurring in our lives now that is good. We share pet stories and things like that. It is safe and it is good.