Help understanding friendship

Hello, so I want to see if anyone can help me better understand things around a friendship I have.

So I meant a couple 3 years or so ago and we quickly became close friends. We would talk online almost daily and go hang out weekly. This went on for a time. Going to events, dinner, just hanging out etc. We got close enough we would joke we were family etc.

About 1-2 years after the friendship started we went on a trip to LA together. I thought we all had fun etc but when we got back from the trip it started feeling like they were pulling away some. I just let it be because things change etc and we still talked and hung out. But about 3 months later I broke my arm and they initially helped me with getting to the hospital etc but then was I was recovering from surgery it felt they continued to pull away and they stopped asking me to hang out, even just sitting on a couch to watch TV.

As I was finally almost recovered they would ask me out again but almost always in group events now. I did try to express my concerns during this but I never have been good at that and I still was not fully recovered and my mind was still in a fog.

Earlier this year we went on another trip but I almost didn't because I was not doing well as all. I found it much much later but I was suffering from very low oxygen levels, mostly in my sleep, and I couldn't think at all and had trouble with many things. But they insisted I come and so I did. But the trip didn't go great and after it they told me they were mad at me. I didn't understand why, bad bad brain fog still, and tried to apologize for whatever I did. But again bad say things like that.

It was after this that they pulled far away. There stopped chatting online with me, for the most part. We didn't hang out together anymore unless it was a group event and even then we didn't talk much at them. They found me friends that they started talking to a bunch and hanging out with like we used to.

I have tried taking to them again to get to the truth of what was going on but they don't give great answers and blame me for things. They act like they still want to be friends but it feels like one of those gestures where you are "friends" but don't really talk etc.

I am very frustrated by it all because I was not in my best state the last 2 years, I have been in and out of issues with my health and throughout a decent chunk of it I had bad brain fog and couldn't think well at all. I mostly was on survival mode. I felt like they left me alone during some of my worst times. That what I thought was a great friendship broke the instant I hit my low point. That they see my issues the last two years as things I could control and when I try to explain that I was having issues and that I did have problems controlling my emotions etc during that time, that they think of it as just excuses.

And I am not saying there isn't some blame on me for things. It never is a one way street. I was not the best communicator and I was way worse with my brain fog. I did get emotional at times and jealous that they hung out with others while I was home alone. I had many issues with my emotions during this.

I just don't understand how it came to this. My memory isn't always the best over the last two years too but I don't feel like I ever did anything bad bad. I tried a ton to be a good friend during the last two years. Tried to reach out, etc. I am just very sad with the state of things and have no clue what to do.