is it wrong to withold a source?

I work in a field where I get alot of opportunities to work 24 hour shifts in small towns on the weekends for thousands of dollars a shift (which helps to pay off my education bills and keep my family from wanting). During the week, I work at a military clinic. I was recently asked by one of my fellow military clinicians at the military clinic where I worked on the weekends. I told him. Next thing I know, I find he is working the shifts that used to by mine to pick up; further, he has trumped up a bogus reason why he can't leave on taskings during the week and told this to our commanding officer. Now, I am getting tasked all over the place, am missing out on many weekend shifts because I am gone and he is fully benefitting financially from this.

So, once bitten, twice shy. If the other person has not earned access to that "special information" then you are likely harming yourself with no chance of reciprocation by giving out the information. If the person gets angry, then likely they would never have earned access to that information (and probably would never deserve it). If they graciously accept the decline, then they may, at a later date, earn that information.

So, not telling them, is completely legit, without a relationship of trust existing prior.

Thats just my view

John