I snooped and I found what I was looking for...

My SO has been acting funny lately and pretty much takes his phone everywhere. I have been feeling like something is up but I didn't have any solid proof. I came over and he was in the basement and his phone was unlocked and on a text message. The first red flag was the other person in the message was not saved as a contact so right away I knew it was another bitch. I scrolled through and saw some things I didn't want to see. I quickly pulled out my phone and took pictures of all the messages. The problem is, the individual he was texting is someone he has dealt with in the past. We are in the process of making all the renovations to the house so I can move in and I will start my TWW tomorrow. I don't feel bad for snooping because I act found something. I'm struggling with how I address this situation and how to move on. What if I end up prego. I'm clearly with someone I can't trust and someone that's dishonest and full of shit.