Is there truly a divorce needed? If you said it then I guess deep down you want out. I’m not sure what isn’t working as you aren’t specific about that other than arguing. It is hard on the kids if you stay together unhappy or split and are happier that way. My parents divorced when I was just out of high school. I definitely always thought when they argued why don’t they just divorce. But it definitely affected the way I treated my mom bc I knew she wanted to leave. So I would highly suggest counseling. My parents almost 15 years later still bring up stuff about each other that we just don’t want to hear about.
I am in a similar situation! My inbox is always open if you need to chat.