Right now I think you're both in the wrong. If you bring up your concerns and he responds with "you're childish, etc" then he is 10000% in the wrong
To take a man like that back and for the relationship to work out he needs to be transparent and open and honest in everything he does, so you never feel doubtful or insecure again, he needs to earn that trust back, and WANT to earn your trust back. Why did he go to the park, who with, how long etc things like that if he’s not willing to be honest and transparent then he’s not striving to earn your trust back then you’ll be forever doubting his moves, his intentions.
Neither is right or wrong. He needs to accept it’s his actions that have made you paranoid and it’s not fair to get angry and call you names when you question him, however, you chose to stay with him so you need to start trying to trust him. If you carry on questioning his every move there was no point staying with him as the relationship is doomed.
He needs to realize he broke your trust and needs to earn it back if he doesn’t care to show you that respect then whats the point. Also you need to realize its not just enough to take him back. When something like that happens ppl need to separate to work on the issues. He needs to earn your trust and you need to see if you can trust him again. Just staying as if nothing happened never works. If your going to be passive aggressive every time your questioning him then you havent forgiven so have no business being in that relationship. Same way as him not coming home and going to the park knowing what he did but not caring how that would make you feel isnt right. I stayed with someone that cheated and ended up leaving years later because I couldn’t get over it. I thought i did but i never did. I wish i had stepped back right away because I would not have wasted even more time. Not saying you should or shouldn’t end it but you need go through the process to know
I’m not married but once men cheat and you take them back it almost 100% of the time makes them feel like “hey if I did it once, I can do it again 🤷🏽” all that he needs to earn your trust back and he’s going to start being honest is BS men’s minds just don’t work like that.
I took back my ex and now that I’m not with him I realize it’s a win for them. Don’t ever take them back