My boyfriend got a new job opportunity and I am thinking of sabotaging it!
You don't want your boyfriend to get his job?
I don't want him competing with my husband -- it will mess up the dynamics of our situation.
I see you don't like change, but you're betraying both people. Have you thought about what will happen if they discover how much you've been scheming and lying to them?
I'm not sure what you're trying to say and it's fine. Lying can be good sometimes.
Sometimes lying can be good, but not when the reason is completely selfish like this one seems to be. I think that for your relationship to go well you shouldn't sabotage this for him, because you're supposed to love him.