Bunkermagnet
Journeyman Pro
Have you ever changed jobs? Should your company have let you go when you started to interview for other roles? You must have had no loyalty to your employer at the time, if you were looking to change jobs.
I think you might be overreacting.
It is my opinion that you should show a professional courtesy and level of respect to your employer that would mean you wouldn't go out shouting how you had a second interview somewhere else. Hand your notice in if you get the job, but don't shout out about it before then.