For starters, im 18, I’m NOT even in a relationship, I’ve been in 1 where I didn’t get cheated on and it ended in a healthy way. And I’m very confident in myself and my life. This wasn’t even a cause for anxiety 2 days ago. But recently it’s been plaguing my mind, I can’t stop imagining it, the scenario of being married for years with kids and finding out my wife is cheating on me. It makes me sick, makes me feel nauseous. I know it’s all just overthinking but I can’t get my mind off it. Any idea how I can calm down? I’m freaking out cause I can’t stop running this through my head. It's just the made up scenarios giving me anxiety and i need help calming down, any helpful words are appreciated