She is temp checking you. You seem to not know. Though I'm not convinced that you don't. I honestly think you know exactly what she is doing. You are backing off and she is reaching out, flirting more. You know she is. I call bull crap on you saying if she thinks your dating that she will. Let me remind you, she dated someone else while sleeping in the same bed with you. So the others are correct with what they said.
You keep feeling the need to respond. Stop giving in to that temptation. I know you use this as a venting forum, which is great. But we are trying to help you progress. You seem to make some progress and then when it works a little you fall for it. lol.
Just like that broad said "oh your doing that now" you should laugh in her face and say "Yup". And leave immediately. And you know what? It will piss her off. She won't believe it.
Coming close to September. If I were you, I'd flip the script and start thinking about not having to pay her that support for too much longer. Two weeks ago, you said you might file for divorce in sept? I called you on it then.
The fact that you can come on here and tell us about her convos should be a sign that you know too much about her, therefore are texting/conversing too much.
Baby sitter. Remember-babysitter. Would you hug the baby sitter when she asked for one? Would you send the babysitter videos at 1130 pm? Would you send "thanks for the apology"- nope. The babysitter doesn't know enough about you to make assumptions and have to apologize.
Again, if you want change, you have to do it. Otherwise we will be seeing you on here next year saying the same thing. Your wife is ok with this situation bc she can be. You seem to want to be with her but don't seem to want to take suggestions. We are only trying to help you here. And potentially her.