<human>: Could you distill the essence of the text into 1-3 sentences?

She and I met three years ago through work. We hit off very well back then, but a month into her working at my job, she started dating a guy. This past August, they broke up due to him cheating on her. We didn't keep in touch over the past three years, except with the occasional Facebook update. We reconnected this past September through a happy hour. She told a co-worker to tell me she was single now, and I ended up going back to her place that night after happy hour. Since then, we've been going several times. Last night, coming back from a date in public transportation, I saw that she and her ex were sending these super long text messages back and forth. I only looked down for a split second and saw his name and the few-lines-long green and gray text boxes.

I figured most people delete the contact info of the person who committed infidelity, so it surprised me when I looked down on her phone and saw his name. We are keeping things pretty casual and organic, so we've not had The Talk or DTR at all, and so she does have every prerogative to speak with him. But it's making me hesitant to have The Talk and I don't know how to talk to her about her ex since she's never personally told me what happened about the relationship (I learned about the infidelity from the co-worker) and I've never asked. I like this girl but I've been hesitant to move forward with anything because I think there's a grieving period after you exit a long term relationship and maybe she's not fully over the guy yet. I've dated a girl in the past who was with someone for three years, broke up, and a month later we started dating, but it ended after several months due to her admitting she wasn't ready. I don't know how to proceed from here.
<bot>: girl broke up with ex in August due to infidelity, we start dating in September, last night she's texting him.