Love/ Hate

Why does there always seem like that there is always one person who you just can't stand. For me he happens to be my brother. Don't get me wrong I love my brother I would take a bullet for him, but more then have the time I cann't be in the same house let alone room as him. Why? Its a personallity thing I think. I can't stand the fact that some how he thinks anything nice i do is to get some thing even though I've never done that. Also he start everythng we do by saying i'm rude or i must want something because i'm nice or that i start everything. I love my brother,but we're never going to be close, and I think I've finally reached the point where i stop trying.