Good luck with WW! I hope you'll still be posting here, you'll be missed! I think you're right to do what works for both you and Oli, it's great that he is supportive and wants to help you with the weight loss.
I'm a bit of a quiet member on here - but I always love reading your posts so I hope you stick around on the board. Your decision sounds totally understandable and sensible to me - hope it goes well with the WW and your OH sounds fantastic.