My boyfriend deleted messages and won’t show me his phone. How Can I trust him?

RKH87
I’ll try keep this as short as possible. A little back story: we had a rough month, we even broke up. We came back together as we wanted to make this work and be better for eachother. That was about 6 weeks ago. We’ve never really had major trust issues. Communication has been our downfall. When we got back together he said he was feeling like I was lying about a few things (to do with money) he wanted proof so I showed him my money had gone on a surprise holiday for us. I always show him if he’s feeling insecure to put him at ease. Flash to now... there’s this girl he met overseas that we have had a fight about before, I trusted my gut and kept asking him if they had spoken privately since he got back 2 months ago. He kept saying no, until last night he finally said “yes! I sent her a message when she was at Oktoberfest saying I was jealous” I asked to see the conversation and he said he deleted it. I was upset! Especially because earlier that night he said he looked over my should and saw a message I was typing to my friend (who’s a guy) and what it said. I grabbed my phone and showed him the conversation to which he responded with “sorry I misread what you said to him”! THEN.. I asked if he had messaged another girl and he said “yes, I messaged Jess” (another girl we have had a fight about before as they used to be flirty online and he liked her shirtless pic recently) he apparently said “what rooftop bar at you at” as she posted a pic on one. I asked to see that conversation and he deleted that too. I lost it! I asked to see his phone and he refused to show me. This to be is shady as hell as I always prove myself when he’s feeling insecure. I don’t know what to do.. maybe he is telling the truth, but the hard thing is I’ll never know, and I don’t understand why would you delete messages but then also say no to showing me your phone. I used to have his passcode until we had that big fight 6 weeks ago and he changed it. Ugh HELP!
My boyfriend deleted messages and won’t show me his phone. How Can I trust him?
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