My boyfriend is leaving me on delivered, but we talk everyday and see eachother on the weekends. What should I do?

My boyfriend just recently stopped opening my msgs on snap. He used to always open them and save the pictures. But for almost a week now nothing. It's worrying. We talk and text and see eachother still but his texts are less frequent and he will not answer my calls if he's with his friends. Im not really sure how to bring up my concern. He cheated on me two summers ago, tried saying he didn't but I had proof. I forgave and we are still together but I'm nervous he's cheating again.

My boyfriend is leaving me on delivered, but we talk everyday and see eachother on the weekends. What should I do?
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