@jlady2307,
Faking an orgasm in a long term relationship is a big mistake. In a good relationship, each partner listens to the clues on how to make the other happy. If you fake the clues, then the process of learning how to please your partner is impossible. I think you already know that.
I don't know your relationship, but I would want my partner to tell me if she had been faking her orgasm. I would be hurt because she deceived me (I wouldn't be hurt by the fact she wasn't orgasms... because I can work on that). But still, if I am in a long term committed relationship I would want to know the truth.
If you are going to change this, then you are going to need to be open. And you need to work together, as a couple. He will never know how to make you finish unless you give him the chance to figure it out.
My advice is that you should be very sensitive, and not put any of the blame on him. Tell him that you were nervous because it was new to you, and that you want to work on communication. But, tell him the truth.