You should make sure to keep yourself safe. No one deserves to be harmed. Maybe it was a one time thing and emotions for out of control. Make sure you have a safety plan incase it wasn't. A friend or family member you can stay with if things get out of hand.

I was in a very similar situation a couple years ago. I was working and going to school full time. Part of it was that I wanted to finish my degree and another part was I was trying to avoid dealing with my depression. I was shutting down and isolating myself and then trying my best to keep myself busy. Has your be thought about therapy or someone to talk to? Sometimes our significant others are hard to talk to about deal issues. It took me 8 years to talk to my wife about depression, but no I fear it is to late to fix my releationship. Talking is the first step I think. Try to have a calm open discussion. Maybe write some things down to talk about since it can be difficult to remember when things get emotional. I hope you can work things out.