I believe it actually goes back and forth. From what I've seen and heard.
about 5 weeks ago my W indicated that she needed to end it, but continued texting and calling the OM. Last week she left one night and I know it was to see him, pretty sure they were intimate, so it returned to a PA. They both ended up sick over the weekend, and she hasn't seen him since. She told me she started to head over there on Monday night, but started feeling bad on the way over and just ended up talking to him (verified that was the case because she drove back to the apartment and sat in her car while she was talking).
Tuesday night they had their latest argument, she vented to me told me what had happened, and that she knows that this isn't right and expressed regret for what she's done.
She wasn't on her phone last night that I'm aware of, but woke up around 11:45 because she had gotten out of bed, came back and looked at her phone. I don't think she sent any texts, but pretty sure she was reading some. So I don't think this is close to actually being over at this point, but each one of these experiences I think gets her closer to realizing she needs to end that relationship.
Sorry that got a little long winded, back to your original question, I think it's gone back and forth between EA/PA.
_____________________ Me:44 W:44 Together 22 Married 21 S 19 D 17, 15, 15. 7 EA/PA suspected 3/30/2016 EA/PA confirmed 4/5/2016 ILYBINILWY 4/5/2016 WW asked for Divorce 5/8/2016 (WW has backtracked)