Well, here’s the thing.
When you are in love with someone, and that someone is the first adult to show you intimate affection most likely since the love of your life was murdered in front of you, you might get a little emotional when his once dead wife is brought back and they’re reunited.
Just a guess.
Regina has in no way been changed to some damsel who is only as good as her man. Remember this?
Not because of a dude. Not because of Robin. She broke that curse because of one person - Henry. And if you could remember canon for just a sec, it was that love that produced light magic. Not a dude then either, though maybe it helped knowing she had not just Robin’s support, but the support of so many others.
So yeah, Regina’s going to be sad. She has a right to be sad. Unless you’re telling me that under normal circumstances when you’re facing a possible break up you don’t get upset. In which case you must be some perfect creature from outer space OR you have never gone through a relationship and breakup/close call.
Crying because you’re hurting does not reduce a woman to nothing.