We can't exactly say her Previous Husband?? Or let's say Lover, is a Bad guy tbh. He Seems to be a Genuine guy, because she picked him.
Though yeah, the Point is What is Our FMC feelings. Whether she still loves her previous lover or if she still has lingering feelings with him (to her previous lover). If so, It's realistic and pretty understandable.
But still, it's really sad for our MC.
And Yeah, She live for almost 17 years Without our MC being around so realistically Speaking, she will eventually meet someone else. Just like what one of the Guy in comment said.
What happened and what did not, doesn't matter here, but The feelings they both holding.