husband cheating?

hey guys, so I was using my husbands laptop today to get some school work done and it's a mac so its hooked up to his gmail. anyways the texts he gets pop up on the screen, as I was doing homework one pops up that says "well you did try to steal his girl so, etc." and so I immediately was like wtf? so I opened it and my husband had replied " 😂 little cry baby". ever since hes been back from work I've had a gut feeling he did something. I found out he was adding girls snapchats and I'm pretty sure texting girls too. I confronted him about the snapchat and asked who was the girl. and he got super defensive and said just someone he met. I dont care about snapchat except for the fact that I'm sure he was texting her too. I also saw he looked up an std clinic but then he told me it wasnt for him but a friend. what do you ladies think? would you confront him? or do you think thatd just start a "why are yhu looking through my stuff" argument.

Edit: I've already set an apt up for Friday since it was the earliest I could go. but even if they dont find anything, how would you go about confrontation ? we have a 5 month old son and are about to close on a house.