The way you can handle your boss, firstly you put it in prayer that God should help you and give you wisdom, knowledge to handle the issue with out loosen your job.
If you have a finance, you telling him, but not the one that he will go and fight your boss, but for him to trust you.
You will tell your boss with respect that you are not interested and you must be rude to him. And make sure you do your work perfectly, so that there won't be room for him to advantage that or excuse to sack you.
And don't collect any gift from him or allow him visit your home. And you continue praying.