"Men Only Please" Would you get mad if your GF made a copy to the key to your home? Without your knowledge?

My friend who is 27 and has very mental and bipolar disorder. Has a problem with her current bf who is in his 50's. Don't ask me why she dates older men I don't know either. She claims they are better than men our age. She has a drinking problem a few days before xmas. She was stressed out with her bf she was tired of his friends showing up all the time. He even has a female friend that she is jealous of. She came home mad and saw he was giving this woman more attenion than her. He left with her to take her somewhere. She got mad and accuses him of haing affrair. She went to a bar and got really drunk. When she drinks she is mean and violent. When she arrived home she trashed his apt when she finnish she went downstairs to cool off. Her bf came home and saw what she did he locked her out by using the dead bolt. Which she didn't have a copy of. They made up after that she wants to make a copy with out him knowing. I think he will get made she says he won't. What do you guys think?