Crippling fear that every man will cheat

For the past month or two, I find myself in constant fear that every man will cheat on me, regardless of how he treats me, his behavior, etc. It's to the point where I want to be single forever just so I can avoid being cheated on. I'm not sure why I have this fear or where it came from. I've been with my current partner for about 8 months. This is my first serious relationship after breaking up with my partner of 6 years. During that 6 year relationship, I was never afraid of being cheated on. I'm in my 30's and the last time I was cheating on was more than a decade ago. I'm not sure if I'm spending too much time on social media reading posts from women who were cheated on and reading too many "anti-men" posts in general. I can't seem to shake the feeling that being cheated on is an inevitable eventuality. My partner hasn't given me a reason to think he'd cheat. He communicates with me when he'll be late, we sleep on the phone when he has to travel for work, he gives me every indication that he's serious about me. What gives? I'd appreciate any and all advice on how I can quiet my nerves!