Samantha’s utterly horrid character development

I found Samantha’s final decision utterly horrible, selfish, self cantered, narcissistic, self serving and morally bankrupt. Ending her serious long term full time loving relationship with a man she loved in a home they shared…. Just because he wasn’t putting out as much as before… that he’d gotten busy with work scheduling demands.
There was no legitimate reason for them to break up. She’s just ultimately a selfish narcissistic egomaniac.