WAH & MLC? - EA/PA - Please Help

[Sam3]

Not much to update this week. Kids & I had a great time on out vacation.
Did not talk to H much this week. A couple of the days he asked about the baby & some house stuff.

He came home this morning & we took our D5 to her open house for school. She is starting a new school. Pretty uneventful. I have a great PMA. I got dressed up nicely. Fixed hair & makeup. And wore some wedge heels. We saw a few neighbors and they all commented on how great I look. And what my secret was. I just said baby & stress. So that was nice to hear.

I'm planning on going back to the beach tomorrow morning & staying the night. My birthday is Monday. So a few of my girlfriends are going with me & we are going to hang at the beach, go to dinner, & then maybe a few local beach bars. It should be great.

H asked what my plans were. I told him I was staying with the baby tonight. So he could take big kids to dinner. He said "why I don't I take everyone to dinner since it's your birthday on Monday. Even though you didnt do anything for my birthday." Then he was interrupted by S4.

I didn't get a chance to validate in the moment. Because they walked outside to look at something. I didn't know if I should bring his statement up again just to validate or let it go?

Should I agree to a dinner with the kids?
Our interactions are so limited. I'm thinking this might be a great opportunity to show my DB skills. But don't know status of OW. And I'm not interested in being best friends forever with someone who put no effort in to our marriage. We still have had no real talks about what the problems were. Although I am being friendly & upbeat. I drew some boundaries about 7 weeks ago in regards to OW.

Anyone have thoughts on the dinner out with kids offer?

Train? Are you out there?