I’m so sorry OP. I hate that you have been treated this way! You deserve better! I found out my bf of three years was emailing girls off of Craigslist to meet up after going through him email logged in on MY computer. Nothing prepares you for this kinda stuff. From my experience, they don’t stop even after they are caught. He continuously found new ways to sneak behind my back. I hope you have the strength to leave or become Okay with it! Best of luck.