I realized tonight after talking to my friend I'm in a close relationship with that's been acting testy lately snapping etc I told her that I understood why she's that way lately but it's not OK.

Simply because if I did say it was ok that would be derogatory towards myself to accept that and I would be devalueing myself.

Also drawing a line in the sand. This behavior is understood right now because of what your going through atm but it will not become the new normal.