I see some similarities between my wife and yours. We also have been together since she was in high school, and she developed the same feeling your wife did. Not being sure that this marriage is what's right. In their heart they feel it's good but in their minds they have a voice that keeps whispering "what if there's something better out there".
Stick with the program. You are getting great advice. You are being an awesome dad and that is something to be proud of. Kids come first and it's obvious to them which parent has their head screwed on correctly.
Do t ask her to stay over. You brought on that last divorce talk yourself by being pressuring and pushing for her to stay over. Natural reaction for the WAW is to push away and want even more distance.
Pull back. Pull way back. Create space between you. Let her miss you and her family and her family life. It's early in your sitch so slow it down.
You said it yourself when you posted about your house that was never decorated. She's indecisive. She doesn't know what she wants but every time you pressure her she momentarily feels she knows exactly what she wants and that's to cut and run. Don't give her reason to run.
Keep posting. How was your day? Tell us about your emotions.
Me, H-34 now 38 W-32 now 35 T-13 now 18 years M-6 now 9 Daughter 3 years now 7 Bomb 11/27/12 - OM 1 year in house separation Reconciliation 12/2013. Healed now 2017