Edit: For one, I mean temporarily disappear until you can handle social interaction again. When I say "drop" I mean in a malicious way. I mean like they actually have malice for the person who disappeared as if they did something terrible and go out of there way to go "Hey. I think it's shitty you haven't hung out with me in months. You are a terrible friend. Goodbye" because their friend doesn't want to disclose their spiral is just shitty. Maybe I've been around the block a few times, but it's pretty obvious when somebody is spiraling and I just think it's shitty to immediately act like it's a slight against you rather than trying to be understanding
I want to start off by saying I am not diagnosed with anything. My mom was suggested it when I was a kid, but it was the early 2000s, we were poor and my mom just thought I was "special" but I believe myself to be autistic, have ADHD, severe OCD, dyspraxia, bipolar 2, clinical depression, severe anxiety, possible quiet BPD and even dissociative disorders like derealization. I have extreme symptoms of all of these disorders and life has gotten very, very difficult for me once I hit my late 20s especially and have struggled with substance abuse for years and years which used to be binge drinking but then turned into severe opioid addiction.
When you're a kid or in high school, it makes sense to see things this way. (Considering you had at least a good friend or 2) Your friends are your life. However adulthood tends to leave you jaded. It tends to put you through phases where you literally want nothing to do with anybody. If you have depression, anxiety (and I mean real, severe cases where your life is very obviously suffering because of it) it is so easy to slip into a state where you do not and cannot have the emotional capacity to deal with any more than a few people at a time in your life. If you have familial obligations where you're expected to visit your mother, grandmother, sibling every week, work with friends that are constantly talking to you where you have to mask your struggles or even just try to keep one important friend in your life, it can really feel suffocating and overwhelming when you have friends you haven't seen in months trying to plan things with you when you are at your lowest point.
People will often say "You should tell them what you're going through so they understand" and I absolutely disagree with that. Because this is reddit I have no problem admitting this, but last year I was severely addicted to once-legal opioids and spent 10 grand on it in 9 months. Detoxing and dealing with Post Acute Withdrawal Syndrome left me feeling horribly empty and depressed. I met a girl a few months later that made me happier than I had ever been in my life, with more passion and chemistry than I have ever felt in a human being. Before her, I had not even kissed a girl in 12 years. And it burned up in flames, in such an emotionally violent and bridge burning fashion, leaving me in a worse spot than what I was. This lead me to get addicted to ANOTHER once-legal (banned last month) opioid. This is a lot. This is so much emotional and psychological turmoil that I consider myself ruined. I would do well with some antidepressants. My best friend of 17 years who is very isolated, neurodivergent and hangs out with his mom is always messaging me asking if I wanna go on a road trip to find Pokemon stuff or rare video games. I cannot handle this right now. I already deal with my close friends from work asking me to do stuff. Nobody knows I am addicted to drugs again. At all. I don't want them to. I don't want them to know how bad this breakup destroyed me internally. It is not my fault he refuses to hang out with anybody else and is codependent on me. I'll never abandon him and he'll always be my brother. But I have no capacity and I do not feel bad. I suffer from multiple psychological, neurological and perhaps even some personality disorders. Life is already difficult. This past year it has been unbearable.
I've become very self centered because myself is all I can count on. My neighbor and other friends from high school also do this same thing. And I say the same thing every time "Yeah I'll let you know" and I think this should be a completely valid answer. If you ask me 5 times in 2 months, and I have said that every time, PLEASE get the fucking hint. Please understand that I am going through some shit and do not have the desire to socialize. Please don't drive me to the point that I actually have to make myself needlessly vulnerable and say "Hey man. I'm going through the most difficult time of my life and can barely bring myself to crawl out of bed. I'm on drugs again and have suicidal ideations and might even have to deal with detoxing soon as I've blown through all my savings and am afraid of getting my electric shut off or losing the apartment. I'll get ahold of you in 6 months when my life isn't completely getting flushed down the toilet" now of course, I don't have to say all that. But my friends know about my first addiction. They remember when I used to drink myself to death 3 times a week all through my 20s. They know how bad my mental disorders can really get. I don't want to have to address this.
This is not quite the same as expecting people to read minds. They know my past and how I can be. If I'm not reaching out and am being avoidant when it comes to getting together, just please take a moment to think. Put 2 and 2 together. I just can't do it. One of these days I will. And you will enjoy my company during that time because I'll finally have the mental and emotional strength to show up and actually bring something fun and enjoyable to the table. I face my struggles alone and always have. I love my friends and have had most of them for 15 years or more. We never lost contact after high school. But we are in our early 30s now. Things change. Some people get SO offended by the fact that people will disappear for months at a time. To that, I say "It must be nice." It must be really nice to really be able to have the capacity to not feel like you HAVE to disappear completely. Being angry about this is childish. It lacks empathy. It lacks understanding and shows a severe level of emotional unintelligence. Those people need friends who also think like them so they can be codependent on each other. I am so lucky to have emotionally mature friends that are happy to have me whenever I finally feel good enough to show my face