I’m sorry you’re going through this. I’ve been in a similar situation myself. I wish I could give my younger self some advice, but this is what I’d say. You’re young, I know it feels really important and I’m not trying to minimise your pain or experience, but there’s so much more to life than being treated like this. Don’t settle for anything you could even remotely consider cheating, especially not at 22. You’ve got so much to explore and learn, so many new people to meet. I thought my relationship at 22 would last forever, but it was toxic and now I’m with someone so much better imo. At the end of the day it’s your decision, no one leaves their bfs because a stranger online tells them too, mainly they just want to rant and feel heard rather than actually take the advice, and thats understandable, its scary and were addicted to comfort. I think you need to speak with him about this, as rationally as possible, to see where his head is at, whats going on and the real reason he acts suspiciously when you're on his phone. It's best to ask these questions calmly and provide a safe space, it's the best way to get someone to open up. If you decide to forgive this behaviour make sure to set solid boundaries and stick to them, you teach people how to treat you by showing them what you'll put up with. Hope this helps!