Was TTC baby #2, found out he's Snapchatting other women..

I feel so lost and angry right now.. I don't even know what my next move should be. About a month 1/2 ago, my husband and I decided to try for our second kiddo. We had our first young (19) and it was time to either remove my IUD or replace it.. he admitted he was ready for another and I agreed. Now I'm still waiting to test, and I discover he has been snapchatting girls, trying to buy some of their OF subscriptions, getting nudes from some of them and saving them in the chats, etc. To top it off, one of the messages was to his exes bestfriend asking about her, telling her how much he misses her and hopes to see her sometime..I feel beyond betrayed.. I haven't even confronted him yet. The only reason I found out was because I was using his phone to send myself some photos from our trip to the park earlier in the day.. they weren't going through on imessage, so I went over to snapchat to send them. That's when I saw several girls' names pop up. I'm sick to my stomach trying to figure out what to do now, and from what I've seen, it has been going on for months. Why try for another baby all while doing something like this??? I don't understand. I really don't. My heart and soul hurts and I can't believe he would do this to me, to our family. He leaves for a training event (Army) Wednesday and will be gone for a whole month.. I don't know what to say or do.. I just feel frozen. 😓