Hi Born2Fly, I completely agree with Keyslost, it sounds like a really hard day under any circumstances. And really well done on hanging in there as long as you did, you should be real proud of yourself!!!
And needing peace and quiet to get through these episodes.........well that's completely understandable
But I'd say maybe hold off for now on decisions as to whether to end the relationship?? Depression can lead your thinking on things like that bigtime, and when the depression eases........perhaps first of all look at some different options with your girlfriend e.g. making sure you have more time to yourself, less "expectations" for you to get involved in "family time", and maybe she could even support you a little more with the depression?? Perhaps time for a real "heart to heart" conversation with her about how things are feeling for you??
Just some thoughts..........
And welcome to PC!!!! Hopefully we can help you a little with what you're going through too, there are some great people on here!!!

Alison