When you signed your contract you agreed to provide your employer with the very best coding you could do and the very best technical solution you can create to

When you signed your contract you agreed to provide your employer with the very best coding you could do and the very best technical solution you can create to their problems. That is what you owe them. In return they owe you a salary, some benefits, maybe some options and a workplace as prescribed by law (OSHA, etc). That is it. You don't owe them to stay until your project is complete, or any other date convenient for them, unless your contract say so; they would certainly not keep you employed for another week to be more convenient for you, if you were being laid of by them. So how they feel doesn't matter. It is a business relationship and well, it's nothing personal. Do what is best for you; if they can't accept or handle that, that is their problem, not yours.