Yes, write a letter, confess all your feelings, your anger, your frustrations, your fears, how this has affected you and your partner, what you want resolved from this....then seal it...and never, ever send it.

I've written very heartfelt letters to friends who have hurt me but I've never sent them. It's not about them, it's about me and how I feel about the situation. They don't need to know how I feel, they probably wouldn't think twice about it if I sent them or they may send back a letter that could be potentially more hurtful than what had hurt me to begin with.

Here's what I'd do, write the letter, explain everything and act as if you're speaking or writing directly to him, put it in an envelope addressed to "Dad", seal it, then stick it in a safe place. I doubt you'd find resolve by actually sending it. He won't get any satisfaction in the letter, only you will, so write it and keep it.