I went through my boyfriend’s phone and he broke up with me, how do I prove I can trust him?

When my boyfriend woke up he caught me going through his phone and he broke up with me cause he says trust is the foundation of a relationship and what I did cancelled everything we had in his eyes. He refuses to give me another chance to prove him I can trust him. Can someone give me advice please? i love him so much I don't wanna lose him and I want to trust him and restart even if I found out he slept with one of his exs while we were on a break.
I went through my boyfriend’s phone and he broke up with me, how do I prove I can trust him?
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