Married 15 years, 4 dc - 14, 12, 6 and 2. I am a sahm. We have no family support near by.
After yet another row last night I am wondering if we are doing the right thing staying together any more. I feel that on the whole we have a good relationship. We can enjoy time and activities together, both pull our weight domestically and parenting wise. Communication is very open I feel, and we are usually able to talk issues through (mainly instigated by me though). Our sex life is acceptable, considering dc, no time, tiredness etc.
BUT...this past 6 months or so it just feel like we are consistently patching ourselves up after fall outs and I am becoming worn down by it. I am really concerned that we are creating a toxic atmosphere for the dc due to this. For background - dh suffers with depressive and anxiety, I have been through it a bit too since the birth of last dc. We also nearly split around 8 years ago (our relationship at that time was awful and we were both in a bad place). I feel that neither of us has really let go of the things said or done at that time tbh.
Our main issue at the moment is always how to parent the older dc. The 12 year old is particularly challenging at times and the 14 year old is a typical lippy/stoppy teenager. We literally have a version of the same row every couple of weeks. It's just seems to turn nasty and bitter so quickly 
The roles are thus - one of them behaves badly, dh reacts in a way which I deem to be inappropriate (swears, rants, continues to 'goad' the offending child and seems to be hell bent on 'revenge'/punishment). He does all of this giving no fucks if the other dc are there or whoever happens to be listening.
I feel compelled to wade in and try to de-escalate situation. This inevitably turns into a row between dh and I. Cue massive fallout with all of the dc witnessing this. He has no discretion and thinks arguing in front of them (about them!) isn't inappropriate.
He would say I consistently undermine him, don't back him up and am generally a hypocrite/pious and ineffective with the dc.
We are at a stale mate. We are both worn down by it, and I am worried about the effect it is having on the entire family
. Maybe it's time to admit we can't carry on together?