I think that having a young family is exhausting. It changes you, your finances and your relationship in ways you could never have imagined. As your love for your DC is unconditional the other adult in the mix, fairly or not, gets the brunt of frustration.
Having young children in a marriage is tiring, having them without one and a messy separation is a whole other kettle of fish.
I'm divorced and remarried. My DC were 1 and 3. I wouldn't have wished the exhaustion of the divorce at that stage in my life on anyone. Seven years on I'm happily remarried with three DC now but the trauma has made me realise that you really do have to work at things and find ways through and around rough patches, identifying them as that. If there are never ways around situations and all compromise is you then yes maybe its time to consider the alternatives.
Divorce doesn't return you to being a carefree 20 something with disposable income. Life moves in one direction, forwards.
Some people I know who've divorced with young DC appear to have been influenced by a sort of depression of growing older, being lost in parenthood, loss of personal identity and middleagedom (okay so i created that word). The divorce has created a sort of spark in life, given them a focus. Post divorce the grass hasn't necessarily been greener. Rather like sometimes couples who've been together years suddenly plan an elaborate wedding only to separate a year later.
When did you last do something for yourself? When did you last have some time to just be you? Before going to far down the looking into divorce as a solution to things is it worth looking into what you need to make you happy?