Seeking Serenity, If you need to pull back, then do it.
Some may say, "But that is just selfish", but its not. It is self preservation of your own sanity, to be able to keep going.
I go out and leave my husband to do what ever he has to, when it gets too much for me, and he has asked/told me not to go. I have still gone out, or something we both would have regretted would have been said.
It wont be the first time hubby has been in a mess with himself, tried to take it out on me and I have walked out and left him to deal with it.
If you feel you are falling into a depressive state, then standing back is the best thing to do. If you haven't got it, maybe a counselor for you would help too. Your showing your strength by asking for
help.