[zullumaster]

I'm of the mindset, where if the only real explanation as to why you're in a relationship that's abusive or not working out, and the all you can say to justify why you're still in that relationship is but I "love" them or I can fix them, then its time for you to get out of that relationship.
Now despite boyfriend #1 sounding like a jerk, cheating on him isn't really the answer either. This guy has some serious emotional issues, and this could just be fueling his next big outburst.
Now I've never really been in any sort of relationship, so I can't say anything from experience, and really don't know any party involved. But If I were her, I'd probably break up with boyfriend #1, but not necessarily go running off with boyfriend #2. Now this may be the fact that people in relationships I find incredibly annoying (Like people who cheat having multiple sig others and I have none? c'mon) But I'd argue that there needs to be some time for herself and soul searching too.