It’s so nice to see a post where the people who are parents are prioritising the various kids, instead of their sex life. I despair at the number of people forcing their current shag into their kids home and lives, there’s never a benefit to the kids involved, it’s solely for the adults. Wish my mother hadn’t inflicted her various boyfriends and current dreadful husband on my childhood, at best it was cringey and uncomfortable, and lifelong damage to me at worst.
I'm really sorry you went through that. However, for many people this is about more than just their 'sex lives' or their 'current shag'. My OH has his daughter with him full time. We don't live together but the three of us spend a lot of time together. It's about far more than sex. My OH and I love each other and support each other - we make each other's lives better. I also get on very well with his DD but we did make introductions very carefully and slowly, and only once it was clear that we were serious about each other.
In terms of blending further, I think it highly unlikely that we will live together whilst his daughter is at home. However, we also have to make it clear that this is our decision, because I do not want her to feel that somehow she is responsible for this.
OP, I think you can only keep doing what you're doing. Make it clear to your DP that you have no plans to live with him. The only thing I might give way on is a more limited blending where the three of you spend time together, but then I'm biased because it works for me, my OH and his daughter.