I think my BF is thinking of cheating on me.

I just got off the phone with him, and he says he's coming home straight away after work. I didn't tell him that I was using his laptop to check my emails and when I turned it on, Skype automatically launched upon startup. I found out he had been chatting with this woman, and they're planning on meeting each other by attending some event called dream tours for singles. At first, I was in disbelief and was really angry, but now I just feel deeply hurt.

I'm planning on confronting him about it when he gets here, but idk how to approach the subject. From what I gathered, they've only been chatting for about a month now and have been exchanging selfies, but that's it. I think about how he's planning on cheating on me during the event and it just makes my chest hurt. Should I give him another chance? After all, he didn't technically cheat on me yet. Please give me some advice! I'm so confused.