Caught my boyfriend cheating

Problem/Goal: I saw screen recording of him j*rking of with another guy. I also saw malicious messages of him flirting.

Context: We have been together for more than a year and I first discovered his first cheating attempt maybe 2 months within the relationship where I saw 2 different screen recording of him fooling around with another guy. (2 different person). I immediately confronted him, we had a huge fight and he promised to never do it again which eventually I forgave him and move forward. I was actually never the same after the incident since I have a bad experience personally when it comes to this stuff. Ive seen him broke promises of removing all messaging platform and installing it again this time secretly.

Previous Attempts: Happened just a few days ago. I found out that he downloaded that messaging app again and saw a couple of messages with a random person I don’t know. Asking about his whereabouts. I just know the messages are flirty.

I’m really lost right now in our relationship. Ive been really understanding and forgiving but I don’t know how long would this cycle be. :( I need sound and hard advice. Please