Should I confront him about texting his ex?

Anonymous
Hi.

so my boyfriend is still friends with his ex, and they have mutual friends. He's at uni so lives away from me and the last couple of weeks has met up with said group of friends twice, for drinks. I didn't have a problem with this, except for when I saw a photo posted on Facebook in which he was sat next to her in the pub or wherever they'd been for drinks. The other day, he came over and whilst he was asleep I went through his text messages. I know I probably shouldn't have done this. Anyway, I found he'd been texting his ex, mainly about the arrangements for the meet up with the mutual friends. She'd asked him if he was coming, then asked if she could pop round to his flat he shares with his friends in the morning as they'd all been out the night before. They were generally just chatting and joking over text. Should I confront him about this? If so, how do I go about doing this as it would involve admitting I'd read his texts.

Thank you for any advice.
Should I confront him about texting his ex?
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