It's hard for SFJs.
I've just been talking to one who is very close to me, who is basically being run through the wringer at a place where she has worked loyally for ten or more years. She was always dedicated, more than the other employees and even most of the managers, although she was only office staff; and I had discussed with her how she was giving them far more than they were giving her; but she just has an insanely strong work ethic.
Now they are trying to basically run her out, as far as either of us can tell, by increasing her work hours past what they know she can handle and/or doesn't want, taking away duties that were hers and that she did well and giving them to less qualified people, etc. I think it's because they pay her too much for the nature of her position, and in that business they really don't want overqualified or overdedicated staff due to the bottom line.
She is absolutely devastated and even bitter, she spent a long time in denial and then just wondering how they could do such a thing to her. Being practical and persistent, she did her best to make her needs known to them and was promptly rebuffed, and now she's been looking for other work while jumping through these hoops until she has an escape route but...
... no, there is no such thing as company loyalty.
I learned that lesson very early in my career, and I also was fairly pragmatic to begin with. But loyalty is everything to her; she gave them her best, which was SO better than what many others gave...and they devalued her contributions, in her mind, now.
SFJ just usually has this expectation of devotion, commitment, and relational fairness. Even when someone breaks faith, it seems very difficult for them to accept the change and move on. Change is strongly resisted. Even when the other side is faithless, the stronger ones STILL try to adhere to their OWN promise of fidelity.
.... as for me, now that I have gotten past some massive lack of self-confidence issues, I'm much more pragmatic. My basic plan is to see the ship sinking early, and have an exit strategy planned... but as my self-confidence continues to increase, I start looking for better ships to sail on even if my old one is running okay. I won't leave people in the lurch but I won't hesitate much to go to a better place for me, nowadays. I just want to keep things FAIRLY stable once I'm there and make sure there are no leaks in the boat that might catch me off-guard.