It sucks what happened and the breakup, yet after your BF working two jobs for an exteneded time and still barely able to keep the two of you afloat I suspect the stress of trying to make ends meet finally got the better of him and he snapped.

Yes, him snapping was bad, but given the current job market (especially if you're in the USA) where you see "Now Hiring" or "Help Wanted" signs practically everywhere, you have to understand that the optics of him coming home from yet another double shift day/night to see you sitting on the couch without a care in the world might go badly. Had you even gone out job hunting that day? That week?

As for what to do now that you've broken up - eat a big dose of Humble Pie and apologize to your parents, let them know you were wrong (even if you feel you weren't wrong) - trust me, that humble pie is better than being homeless and hungry. If your parents let you back in (and I suspect they will), then you have to constantly keep looking for a job until you find one - and then you do whatever you have to do to keep it so that eventually you can move out on your own. It might not be the job you want, but it's the job you desperately need.