Boyfriend still hurt for a previous relationship?

Some background : we are in our 50s, my current 3 months boyfriend had a relationship live in girlfriend for 7 years that ended almost a year ago. We had a weekend getaway this last weekend. I checked his phone.. I should have done that but it was easy to do it and I had a gut feeling. I saw texts he sent to his ex complaining about how wrongly she did to him , he obviously still hurt for the breakup., not reply from her. He was blaming for infidelity and time wasted. I asked him if he was in contact and he said no, my question for the guys , I don’t want to tell him I saw the messages , how do I approach him , besides this we have been having a good time
Boyfriend still hurt for a previous relationship?
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