Seeking relationship advice.?

Okay, so here's the situation. About a year ago I was seriously depressed and ended up in a psych ward. I met a man there and we became friends and then more than friends. He has a younger brother who he lives with. Me and the brother ended up having more in common and more chemistry together than I did with the 1st guy I met. So me and the brother started seeing eachother. We eventually told the 1st brother. The 1st one claims to be bi polar, which no one beleives because he has no signs of being bi polar. Well the 1st brother is very abusive towards the 2nd brother. He is emotionally and sometimes physically abusive towards him. He doesn't work or do anything, he just depends on everyone else to do everything for him. He also can't stand spending anytime alone, which is difficult since I am seeing his brother he always makes it very difficult for him to leave and throws ';tantrums'; by yelling, throwing and hitting things. Whenever things don't go his way he threatens suicide. No one can really stand this guy and most people call him a monster. My boyfriend, the 2nd brother is a very kind hearted, openminded sweet person and I think he feels obligated to continue living with him and taking care of him. The 1st brother is in his 40s and 2nd brother is in his 30s. I am trying to help the 2nd brother out by offering to pay his rent somewhere else, or anything else I can do to get him out of this horrible situation. He comes home from work every night just to get lectured and yelled at and sometimes physically abused. What can I do to help, or what would u do in my situation if you were me? It breaks my heart to see him putting up with this situation and I want to do all I can to help.Seeking relationship advice.?
Dealing with other people is one of the most challenging things in our lives. Dealing with crazy people is just impossible. You need to be able to distance yourself (and your significant other) from the crazy person, even if its just emotionally. Having all those physical and emotional attachments to someone like that is very trying and depressing. I feel very sorry for him but if after a long time, nothing is changing (or if its getting worse), you have to give up and move on.