Should I just leave?

So last night I'm laying ib bed just before 3 a.m. And I just happen to see my husbands phone of because someone texted him, so naturally I was a little surprised and bothered and because we have a 5 1/2 month at home and no one needs to get ahold of him in the middle of the night. So tonight I looked, besides finding a shit town of screen shot naked pictures of other girls I found bits of a conversation from Whisper (a sight both of promised not to use anymore because it's caused us problems in the past) heres fhr parts of the conversation that have me worried. The tattoo isn't from me, it's from hus ex before me which makes the first statement all the more worrisome and the second he says he's single.

What pisses neboff the most though is that he's sending pictures of our daughter to some random ass stranger on the internet, how doea he know he's not getting cat fished by some child predator?

I screen shot messages (the ones here) from his phone and sent them to myself then sent them back to him telling him to pack a bag before he leaves for work in the morning because I don't want to see him for awhile. Am I overreacting or should I just walk away?