Can someone explain the ending Kinda get the gist of it but I'm not sure if my interpreta...

Alex loves Clark and became a yandere (he wants Clark's attention for him only) when he went to the doc's house, he saw a picture of the doctor wearing the same ring as Clark's (the one Alex took from him). When the doctor died, his ring finger was cut --this was a message from Alex to Clark indicating that he's the one who killed the doctor.

For the ending, it showed Clark alone unwrapping something, i think that is the knife he used to kill Alex and eventually killing himself also using the same knife

I got the first part...

What I'm talking about is the finger... he was not unwrapping the knife it was the finger of doc... How did he get it? What does the last scene meant

From how I interpreted it is that Clark was able to get the finger back from Alex’s place but we don’t specifically know/see how, the creator didn’t put a scene of him finding the finger in Alex’s place so that’s just something we, the readers have to imagine for ourselves.

And as for the ending it’s very sad ending. He lost the man he genuinely loved to a sociopath who he had high expectations for but ended up disappointing him to the very end.

Risking his life and having the man he love die due to his arrogance and his side hobby (analyzing murderers) he’s now alone. The only thing he can do now is feed the fish (the last remaining thing that reminds him of the Doctor), look at the finger of his ex he still held a torch for, and live with this guilt for the rest of his life.

Well that’s how i interpreted it :’) Hope this helped.

Thank you for enlightening me. Now I'm sad after knowing.

This is how I interpreted it too. Clark still genuinely cared about the doctor even if he werent capable of being in a relationship with him and the last panels is Clark in his loneliness mourning doctors death, holding on to the few things left behind (the fish and the finger).