I'm feeling very lonely today: I met some of my dearest friends in the most unexpected place after being a shut-in for years and a few hours later I realized how much I miss them and I suddenly felt very lonely
I am sorry you are feeling sad but how did it come about that you were meeting old friends?
My friends showed up in front of my apartment building. Thats when I realized how much I missed them
You have been living a lonely life shut in to your apartment for so long. Seeing old friends will make you realize your loneliness and how unhealthy it is to stay cooped up in your flat. Get out and live your life.
I know.
I am glad you learned this lesson and I think you are doing the right thing for your happiness.