I'm in a "inappropriate" relationship. How do I break up with them? I don't want to be in the relationship anymore but I care and love him. How do I not hurt him?
The thing is hurt is something he will have to deal with because your honesty is your truth, and you deserve to live without feeling inappropriate. Its not good for you self worth and value. Communication of the truth as truth and not as an excuse or fluff is the best way for anyone. You say you are not comfortable in the situation because its wrong many levels and you are having difficulty facing you self in the mirror.
It has everything to do with you and nothing to to with him as a person, its just the right thing to do to live in your truth. Rather than a falsehood.