I think that as long as he is being kind and fair to your DCs you should base your relationship on how happy everyone is, not whether there is real parental love there.
My dp and I are completely in love, he is wonderful to me. I like his DCs, but certainly wouldn't say I love them. He probably would say he loves mine well some of them anyway but certainly not to the same extent that he loves his own.
He doesn't play a parental role most of the time, but will back me up with my eldest if I'm struggling with him. He has been to the occasional school concert but would certainly never come to parents evening or anything official in place of XH. He wouldn't help with homework unless they specifically asked him something and he will read a story to all of the DCs if his are staying with us, but wouldn't do it just for mine, which is totally fair enough and they probably wouldn't want him tucking them in instead of me, they want their mum to sit with them and say goodnight.
I think that if you will only accept a total immersion in the nuclear family, you will really narrow your chance of a successful relationship.
My dp and I treasure our time together without the DCs, we limit the amount of time we are together with them all as it can be stressful and when it's both of us with just my DCs he stays on the side lines. It works well for us and means that we're not always dealing with the domestic drudgery, we are first and foremost a couple rather than a family, which means we can concentrate on making each other happy.
I can't see the original quote in bold at the start of yellowdaisies post, but fwiw I feel very much like this with DP's youngest dd. She is very reliant on him and wants him to do everything for her, so if I offer to get something she will blank me and ask him to do it, if the other DCs are getting breakfast for themselves she will wait and get her dad to sort hers out when he gets up, when they are all playing together she's asking him to do something with her or sitting with him playing on his phone. It makes it very difficult for anyone else to get close to her.
whatsgoingoneh I thought your dp sounded like he had it just right, not selfish at all!