For me, having emotional/physical affair during marriage and not wanting to stay single/date other guys after marriage is two different things. I assume you were referring to the first one where there is an affair, while still in marriage (prior to BD)?
It's obvious that the majority of people wants to have a partner long-term. That is my intention too.
The thing is that she can only divorce without my mutual consent only after around 1y from now. Therefore, it's strange that she is fully committing to this now.
At least I am not emotionally affected by these moves anymore. I am still a bit curious why she is acting this way now, but that's it.