do I confront him?

I never thought I would be one of these women but here it goes...My husband and I had our first child in October. ever since then I have been very in secure about our relationship. it started with me getting on his tablet one afternoon to pull up infant stimulation videos on YouTube. Well when I turned it on all these Instagram DM's were coming through from a friend of ours (married as well). I confronted him about it asking why they were sending flirty messages, he didn't really have a reason other than he's a very sexual person, I kinda let it slide as he has told me before he thinks he's a sex addict and I wasn't cleared for sex yet. The past few weeks I've been getting a weird feeling... so I took his tablet again...Well no Instagram messages but I did notice some fb messages between them. When I went back later to check them they were gone. Curious I took it to work a few times and realized he deletes them end of day all the time before he comes home. Well today I was doing the same thing as I guess you'd say my anxiety of this all was pretty bad. Well what do I see but them trying to video chat (thank God her daughter was needy) but he sent her a pic of him holding his junk in his boxers saying he was wearing her fav (telling me theyve done this before). He tells her he has to start work but is sad and to cheer him up...Well she sends him a topless pic. I want to confront him about it cuz I'm obviously really hurt (especially since he told me this morning he loves me with all his heart), but i only found it cuz I was really snooping. He is very aware of me being insecure, as I kinda got upset as he didn't post anything on fb for vday (he knows I don't even like the holiday!!)