WHAT WOULD YOU FEEL?

I dunno how to start this. My husband's past relationship (just one) lasted for almost 10 years. His ex cheated on him, that was the reason why they broke up. Recently, i saw one of his convos with his friends on a Group chat about their breakup. He was telling his friends how they broke up. Then what really bothered me was, he sent them photos. Photos of all the evidences of his ex's cheating. Like conversations of his ex and the third party and photos of them together. He mentioned there that he kept it as a reminder. They talked and talked. He talked how broken he was before, how he moved on and so on. His friends told him how lucky he is now, that we're married. They're telling my husband that i am finally his "The one". He agreed. He said there that he is so happy now. I am happy about what he said there. But i really am bothered why does he still keep those screenshots of evidences. I don't know what else to feel. I told him before how insecure i am about how long their relationship was. Who wouldn't? Everyone, as in everyone thought that the both of them would get married. He just went MIA on his friends when the brokeup happened then when he came back years after, i am the one he married. What do you think? I know i shouldn't be worried 'coz he's not even cheating or whatsoever. But what I'm really worried is, what if he isn't totally healed? It has just been 2 years since they broke up. And it has just been 3 months since we got married. We were in a relationship as bfgf for almost a year. (Brokeup was in October 2017. We met and got together in September 2018. Got married in January 2020) I know when i met him that he was so scarred for life for what his ex did to him. I really can't help it. I cried thinking about it. He doesn't know it yet. Maybe it's just PPD since i just gave birth last month. I need your advices mommies :( ... I'm really bothered. I'm overthinking and paranoid. Maybe signs of PPD talaga :(