Dealing with a complex MLC and/or Wayward Wife #2

[P_Jam]

I'm back - Update:
Had S5 (now 6) Birthday party at my house last night. Her parents, brother, cousins, her, myself and 2 sons.

I did just as I did previously at the hospital. Was happy (not distant) engaged her in simple/small talk but focused on the being the host of the party (food, cake,etc). Took a while for the cousins to get there so S9 was sad and disappointed as he wanted to play. So he asked me to play catch in the back yard while we wait, so I did. She again got to see a 180 in real action. I have been so much more present with my kids, I love it and I love for her to see it. My present for my son was his favorite of the night (which made me feel good) W immediately went on amazon and purchased same thing for her house (lol).

Party went well, all happy and comfortable. As everyone left I helped load the bags/presents into her car (it's her night with the kids). Kids were kicking the ball in the street. After helping her I just walked to the sidewalk by myself (while she was still loading) and watched the kids. <-- point, I made no 'special' connection in regards to loading the car or being close to her 1:1. Just being a gentleman and walked away.

She then joined me on the sidewalk where we had small talk. She thanked me for hosting and I said; "my pleasure" glad we could work this out.

She then came to me and grabbed me for a hug. I assumed it was a simple friendly hug and gave her a quick one back and started to pull away. She held on and pulled me in for a long hard hug and whispered "I miss you". I just simply said "Yep, I miss you too" and then ended the hug.

I will see her again on both Saturday and Sunday. Saturday for Son's football games then on Sunday for S6 "friends" birthday part at bouncy house. Sunday will probably be a little odd as all her close friends with kids will be there and it will be the first time I have seen them all since S. I'm sure I will get lots of hugs and "how are you doing". I know that some of them know a bit of the details (PA). I plan to be upbeat confident and say: "I'm good, still surprised this is how she wants to end it, but I refuse to let this define me, so I will be fine".

although I have made some mistakes with the last relationship conversation I still have been very diligent in not texting or calling her (aside from the one call regarding birthday). I let her come to me for ALL communication. She texts me at least twice a day. It is still just about the kids - but I do not initiate anything to her unless it's NECESSARY. I'm getting better. Even with the hug and the "I miss you" I was not as shaken up last night after she left. I know I felt good because she said it, but logically I continued to tell myself "it doesn't matter - you're still plan B" Just need to get through this weekend and we don't have a lot scheduled to be together anymore (other than Saturday morning football). So will continue with NC.

Couple of question for the experts:
1. Next week will be tough on me as well. Our anniversary is 5/5. She will have the kids. Do I do/say ANYTHING on this day?
2. Is me being plan b in her head - overt? Meaning, is she really overtly manipulating me to feel more comfortable while searching for Mr. Right or is possible she is still trying to take this time/space to reflect and figure things out? Is my empathy for her just more NGS? Sooo hard to be happy but also be somewhat distant when she is coming to me. I get it, probably just a temp check - but so hard to balance. Did I respond appropriately?