Extremely f^cked up love story?

Okay Im going to try to summirize this, but its a a long story, Im going to try to make it as short as possible. This guy talked to me becuse he liked me, back then I was apathetic and oblivious to guys.He court me for a long time so I decided to give him a chance and let him be my friend first; however there's a twist to the story, he introduced me to this other guy who I wasn't interested in at first. But then I got to know him personally, and realize we had a similar past and we liked each other.I met his brother not literally but they grew up together and are link by family, so might as well call him his brother.I talk to him a lot and practically became really close friends.He told me he thought his brother liked me back. I didn't know he liked me back so when he told me this, I was suprised; he doesnt usually likes that many girls, or shows that he has interest in them. but we just didn't tell each other that, plus his friend liked me so it was better not to. Somehow people found out that I liked him so I ended up telling him, he told me he liked me back but didn't want a relationship, so I was dissapointed and told him I was going to give his friend a chance. Because he knew about us liking each other and he was a nice guy. The guy that I liked me told me he didnt care and if that he made me happy then i should give him a chance. I went out with his friend but didnt end up well. the guy i liked, liked this other girl obvously more than he liked me becuase he actually wanted a realtionship with her, this made me upset but I wanted him to be happy so I end up helping him out getting the girl (she had a boyfriend at the time but he treated pretty bad so i encourage her to brake up with him and go out the guy i liked). He knew this and end up thanking me I said no problem even though it hurt to see them together. They went out before I went out with his friend. But it didn't matter is like we both went to different people because of other people. In the end it end up badly for both of us. He started being really crud to me at this point I still talked to his brother a lot, so he told me the things he said about me. In the end there was a lot of drama and we ended up thinking we hated each other, we didnt talk to each other but we always end up crossing paths.Somehow there was always someone in his group of friend that ended up liking me and it just stayed that way for a while jumping from one of his friend to the other. In the end his brother ended up falling harcore in love with me. But i didnt feel the same way back then,to be honest i never stop liking his brother thats why i couldnt feel the same about him,he was more like a close friend but i couldnt bring myself to confess how i felt about his brother.ironically he was more like a brother to me lol.Me and the guy who I liked acted pretty mean whenever the other was mention I know this because of what his brother told me, about the weird realtionship we had becuase somehow, we always ended up talking to each other and having an argument in the end. we acted like we hated each other . I stopped talking to him but never his brother and well he knew he liked me so somwhow we stayed in contact because of his brother. Doctors dyacthose him with lymphoma(his brother) and thats what brought our group back together despise of everything that happened in the past they are both still very dearly to me and we hangout almost everyday of summer the three of us. He knew his brother loved me because we talked about it, but I honestly can't feel the same way. He's dying and that just makes everything even harder. I dont even know if I still like the first guy I liked or how I feel about his brother now everything is very confusing.? I dont really know how I feel but in the back of my mind i know i never stop liking the first guy i liked its been more than one year ;/ and I dont know. Btw there were other details of the story like my best friend liking the guy i used to like that was when I finally thought that i wasnt going to hear about him at all. but seemed that whatever i did, i always came back to him ;/ and it was a concidence how they met. but he didnt like her and she got over him. now im the one stuck in the indecisiveness of love or a less strong word affection. His brother told me he liked me yesterday after he admitted he was over me months ago but cirmcustances make it hard to make this simple Is like hes always been there for me and theres no reason for me not to like him back, except the fact that hes going to die and if i let myself love him that would be setting myself up. the guy i liked first I dont know how he feels about me I'm pretty sure he doesnt like me but he's a weird guy thats what i thought last time and i was wrong.And i can say that i still like him :( But knowing him he doesnt like me but he cares about me, its this a weird heartbreaking triangle lol i guess my question is what should I do &