My gf has given me 0 reasons for me to be paranoid about her loyalty.

Sex life is great and I'm lifting, well off, 6'2'' ripped / juiced and have good sex.

But I'm mentally ill somewhat and have paranoid obsessive thoughts.

So if she goes somewhere where there could potentially be a guy whose SMV is higher than mine I will feel this intense fear and paranoia of her cheating on me with him. Not fear of her leaving me for another guy - no, but being cheated on and not knowing is my biggest fear.

I am reading stoicism and trying not to focus on things I can't control and only focus on frame (which doesn't work with inner mind mess), lifting, money and dread.

My gf has work in fitness industry, so it is natural she will encounter guys like bodybuilders and fit mofos. Now, I'm very well built and have been told that pretty much have the perfect body by guys on /fit/ and other bb discords. So I should have nothing to fear. I also logically am richer than most fit dudes and am pretty tall.

Yet I still have this intense fear bordering on violence where I feel like I'd be willing to fuck shit up.

It is nothing new and nothing related to this girl in particular. I'm just mentally fucked up like that.

Please recommend me some breathing exercises or mind exercises or say something that could ease my mind. I don't want to start snooping on her messages again or doing that creepy shit (I did before and found nothing).

I hate myself and just want to bash my face in with a baseball bat for being for being so fucking stressed out despite being a fit, tall, well off dude.

Basically I fear about being mogged and think that in such cases I could only redeem myself with extreme violence.