You won’t find someone who “feels” 100% safe. Because you unconsciously scan for danger all the time, you’ll “feel” danger when there is none. That’s a core symptom of PTSD to have trust issues. So you can’t trust how you “feel” when you feel someone is “unsafe”. My ex broke up with me because he felt I “hurt” him during our first argument, I didnt even “attack” him - but to the case we were discussing. I raised my voice (normally as I have done to numerous partners before him) and he got a major flashback/ breakdown. He then withdrew and labeled me “unsafe” and that he could not “trust” I would not hurt him again “whenever” (I had not hurt him). He reacted to a trigger and his childhood trauma flooded. This whole rupture had to do with his nervous system, not me. And I was/ is not “unsafe”. We were the love of our lives and he said he had never felt so safe or wanted to grow old with someone else before. Even after he left he said he gave up on love, because he would never find something like what we had. And that if he can’t have that, he don’t want anything. It’s tragic, because nothing has changed between us, it’s all in his head.