I also can relate. Learning how to deal with being triggered is the whole ballgame for me. My mind goes wild with unwanted thoughts. It takes practice to learn how to overcome the anxiety , and sometimes therapy and / or medications.
Briefly: I was with someone a very long time and had a toxic relationship. I wound up alone for awhile when I started to get so lonely I wound up back with that person. I changed , but she didn’t. Still no communication. Still I get triggered by her INACTIONS ! Feel like being alone again. But I don’t want to be lonely. That’s something I have to learn. I also am getting very tired of interacting with people. But you really need to. Even if it’s just going to the grocery store. I’m sorry for rambling, just want to say I know how you feel.
I certainly wish you the best.