And last night, they just hit each other all the wrong ways, and badness ensued. Things were said, quite possibly on both sides, that shouldn't have been, and I'd be willing to bet that the fact that both of them were under a lot of stress and having a generally sucky day led to some of those things being taken harder than they otherwise would have been. And, as far as I can gather, they inadvertently broke each other.
So what I'm asking, because I think both these people know who they are, is that when they feel better, they talk to each other and try to work this out. I'm not asking you to brush it all under the carpet, or forgive each other instantly (it'd be nice, but I know it may not be possible), just... talk. For me, if not for yourselves.
I'd really rather not see you both being hostile at each other (or miserable) because you were both having a bad day and things got out of hand. Not if this thing can be resolved.
EDIT: I am not going to be taking sides in this thing if I can help it. I love you both, which is precisely why I refuse to pick a side here, especially not having pieced together the full story from both of you.