Up to you patty, you have told your partner and if he is supportive that is the main thing, you can share your thoughts with him.
I told people I was quitting alcohol basically to keep me honest, it made me want to continue to stay sober so I wouldn't disappoint them. Others I just said "it's for a few months" but I plan to continue forever hopefully
Just so long as your aware you don't owe anyone an explaination, I had to learn that a few months ago and it's really sunk in now, and also as others have said, people don't really care all that much, definitely not as much as I thought they would and the ones that do I don't really care for anyway because it's my life, my decision, nothing to do with them
good luck on your journey x