I can tell you from firsthand experience how it feels to be in a relationship with someone who always has to be right. It is frustrating and exhausting. My xh would argue with a fence post if he thought he could be right about something. And he didn’t just argue, he’d look up crap on the internet that supported his side of whatever it was. I got to the point where I would just say “you’re right” and walk away because what I said didn’t matter at all. He didn’t care. Don’t do that to your gf. I agree with Mach that all of your “I guess it is because…” really doesn’t serve you. You need to figure out the root cause so you can find the solution.
You and your xw do have drama and of course it takes it’s toll on your current relationship. You share kids with your xw and therefore can’t cut ties altogether but you don’t have to engage either. Because you want to be right so badly, you just keep engaging. I think LH makes a great point that if you have custody arrangements that depend on y’all communicating and cooperating, you should definitely go back and have them explicitly spelled out because you have both proven you can’t effectively co-parent.
Me 52, H53 Bomb drop 9/29/2014 Divorce from XH final 12/17/2014 Marriage #2 12/31/2019 5 adult (step)daughters (3 from XH's first marriage, 2 from current H's previous relationships) 6 grandkids