Am I detaching from my husband? Why do I feel like this?

Recently, I saw some stuff on my husband‘s phone that were extremely inappropriate for a married man, I won’t get into it 

 We just welcomed to our second child a month ago and some of the stuff I found out he was doing, he was doing while I was pregnant. When I saw this stuff, it almost didn’t even anger me. I was more so disappointed I feel like then anything but it didn’t make me mad like things like that would have had me feeling before. I also found myself not even really wanting to deal with it. I really debated with myself on even bringing it up or not and it was some pretty shitty stuff. like I’m just confused with myself because normally I would’ve blew up a really tripped out about something like this. I don’t know if it’s because I’m so overwhelmed with just having a baby and having two kids now that I just don’t want to deal with anything else or if maybe I’m just really not caring about what he does now.. I even waited a couple days to bring it up to him and those couple of days I was able to just go about my business as normal, and I didn’t even feel any resentment towards him. I also didn’t even really argue with him about it. I just questioned him and he answered and we left it at that I myself just don’t understand why I don’t feel more angry or her about this, this is out of character for me.