<human>: Background: I'm 22, college grad, and working as a scientist a few hundred miles from home. My little sister just finished high school, is 18, and will attend a local state university while living at home this coming semester. We're incredibly different people. She's quite popular, runs with the BMX/hardcore crowd, and is generally involved in rifraf activities - smoking ganj, drinking vodka, staying out too late. I can't say that wasn't me four years ago, but my priorities were a hell of a lot straighter. The main difference between us is she identifies with her friends: I was just an associate. 

The problem: my sister threatened to hurt herself over her boyfriend being with his (crazy) ex. When my mom got the call from my sister saying this she immediately left work. Being 22, out of the house, and generally removed from my family life and affairs, I don't know if I'm being invovled or supportive enough for her. Not being there for her has been a struggle, but I need to live my own life and grow up too. 

Reddit, how can I be a better long-distance brother?

Can you condense the text into three sentences or less?
<bot>: little sis threatens to cut herself over boyfriend drama; I don't live near home and am uncertain of how to support my sister and family through the drama.