What to do !

just me

So we have been together 18years our first 10 years it was off and on finally we got it together in 2013 had 2 new boys but now we are just constantly bumping heads and no matter what our communication skills are long gone I have started a child support case on him and as much as I don’t want to put our kids through it I think we are going to have to separate and I just don’t know what to think or how to diffuse all of this going on