Should I say something

My husband and his coworker got close - nothing happened. Just light flirting here and there. It made me uncomfortable so I confronted him and he said he felt we had no chemistry. And that he loves me and wants to make it work. Fast forward to now things have been amazing. He’s been buying me flowers, spending his time with me, we’re laughing and talking again, going on dates l, and he’s just so invested in our marriage again.

Anyways, I fucked up and looked at his phone (I’ve talked to my therapist about this and I’m working on not doing this) and saw he talked to her back in July a month after I confronted him about her. I have no idea about what was talked about because it was deleted. But his history shows they texted. Like there’s a date of July 16th. I’m not sure whether I should say something. Like I said were in a great place now but I wonder what was said… is it worth. Going back there… should I let it go. I plan to bring it up to my therapist I just done see her until Friday .

They’re both married. Some ppl saw it as flirting others didnt when I first saw their text messages. I’m just not sure what to think. I know he said he admitted to flirting with her before but that he didn’t want anything like that with her that his goal was to prove me that he loves me. And wants me. I know they work in the same field and will see eachother occasionally. I’m just struggling with this.