How to let my Dad know I'm moving out?

I am a young woman who moved back in with my parents 7 months ago and I’m ready to move back out. Not with roommates this time but with my boyfriend that I’ve been dating for about 1 year now. I’m 22 years old and feel at this time in my life that I should be able to make decisions without getting crap from my parents. Well that’s only half true. My mom completely understands where I come from and the decisions I make because she realizes no matter what kind of life she expected for me that I am my own person and will choose the path that makes me happiest. On the other hand, there’s my dad who I never please. He has always been hardest on me and there are definitely double standards in my house because I’m the youngest.. of 2 older brothers so of course he’s going to be way more protective over me. The only problem is that he isn’t just protective but not logical at all. He hates the fact that I spend the night out 75% of the time and basically already live with my boyfriend. Now its come to a point where we both want to live together. We’ve thought it completely through with our hearts AND minds about the situation.

I’ve thought a lot about how to talk to him about this because he never takes anything I say well nor cares about how it makes me feel. Even though his approval doesn’t mean that much to me, I would like to stay in good terms with my family because after all, they are just that - Family.

Does anyone have any advice on what to say so it doesn’t turn into a huge argument and I end up leaving without returning?