Thanks for all your replies...

To answer your questions.. we pay $165 a week. His brother has many friends he can stay with, however, in the past he has been involved in drugs, and those friends he has, are all involved. He is trying to get off the drugs, so doesn't want to tempt himself if that makes sense...

Last night, I completely lost it, I knew it was coming... I could feel it... had a really bad day.. and it all came out!! My boyfriend went to where his brother was visiting friends, and asked him to find somewhere else to live, as it is causing too much stress, and out house is just too small... He was fine with it and is organising to stay with their dad... that is all really good... I feel so guilty... but I think I have done the right thing. However, I don't think this is the end.. and the way my boyfriend explained the situation to him, I think it was more like.... you have to look for somewhere else soon.... and to me, that's kind of like, you can stay for a while longer... will see what happens anyway....

Thanks again everyone for your replies