How do you know?

So my SO and I have been trying to have a baby for the last 6 months after having the mirena for 4 years. We currently have one child who is 4. We have been together for 10 years. We’ve always had issues throughout our relationship with trust and just not expressing emotions. We never do dates and we argue more than just talking. He spends most of his time on his phone playing games and thinks it is rude of me to ask him to stay off of it for any amount of time for any reason. I do everything around the house plus work, rather than compliments and appreciation he finds anything he can complain about. I find myself thinking about being free of the relationship and living on my own with our child a lot. I guess my question is how do you know when you’re marriage is over? I know having another baby is not a solution to any relationship problems.