It's hard to say from my perspective. My wife isn't happy, she doesn't foresee a way to be happy while staying with me. There have always been big swaths of personal differences between the two of us, and while I've never really saw them as a problem to our relationship, she currently sees them as unsustainable. The tipping point was her coming to the realization this year that she doesn't want kids. Kids have always been my primary goal in life (no jokes plx), and while I'm willing to entertain the thought of not having kids, she's not really willing to entertain the thought with me. The truth is our aspirations forked into opposite directions and it's hard to imagine a way to merge them again.
I wish there was a more clear cut answer but there really isn't. I'm kind of hoping she will change her mind before she goes through with this but signs are pointing to that not being the case.
I don't regret the time spent with her, the last 7 years have been the happiest time of my life, and even if it didn't turn into your typical prologue for the movie "UP" that we all have in our minds, it was still an incredible journey.
To some extent, if you haven't heard about love languages, I'd read up on them. I have major issues with the concept, but some ideas are good to understand. Essentially, your relationship provided you with things that made you feel happy and loved, but did not provide your wife with the same feelings.
There are a million other possibilities in play and that's really not for me to guess at. Relationships can be hard. ---
Donny: Are they gonna hurt us, Walter? Walter: No, Donny. These men are cowards.