Who do you think the management are thinking of?? You????Nope. They are thinking about the bigger picture of which your a tiny part of.
I didn't mena you get offered another job and go running to your boss threatening to leave. You go see other companies for your own benefit, no one elses. Never let on you have something lined up. You can approach them with a bit more confidence knowing that you have something lined up, but never let them know that, just play the loyal employee part and harp on about how you really enjoy working there etc but need to know for your financial well being what their plans for you are. No boss should be offended by that.
If any of my staff give me the big I am, I let them know that they are 100% dispensible, plenty of unemployed mortgage advisors out there