Crappy night

What a crappy night. I went to sleep last night at about 11:30pm. This is fairly early for me. The reasons I went to bed so early is because I wanted to wake up early so I could get some stuff done before I go to a birthday party. Well early in the day my brothers girlfriend sent me a message asking if I knew where my brother was, I told her no but I knew his phone was dead so that’s why he wasn’t answering his phone. They ended up getting into it over the phone once he got home. She was accusing him of cheating and a lot of other crap when really he went to the convention center with one of his long time friends. After charging his phone for like 20 mins he left again.
At 1:30am my phone starts ringing, and it’s my brother’s girlfriend. As soon as I answer I can tell she is drunk. She starts asking me if he is at home and I honestly didn’t know so I had to get up and go look, I told her no and that his phone was dead again so that’s why he wasn’t answering his phone. I went back to sleep only to wake up to my brother texting me saying she was pissed off and she would probably call me again so I should just put my phone on silent. I did and finally went back to sleep. Then at 3am my brother is knocking on my door asking to borrow my charger and is complaining about his girlfriend. When he does finally let me go back to get it is 3:30. I wake up at 7:30am only to hear him and her fighting once again. I don’t get why my brother stays with someone who doesn’t trust him.