Hmmm, this might end up sounding so that it might be taken a bit wrong, but... (assuming there aren't other reasons that the relationship is fragile, in which case ignore all...)
you've just had a wonderful experience.
An experience within that existing relationship which, -- isn't it already working on a level you haven't ventured to before?
... that does't sound like 'relationship isn't going to work out...'?
You want more which is natural, we always want more of a good thing.
I'd suggest to take time and really find out what it is that he doesn't want more of.
Maybe he associates things with 'The Lifestyle' that he doesn't want to get into.
But usually, step by step, wouldn't you expect him to get into doing things that you so obviously enjoy, and well, you mentioned how much it turned him on...
That's very true ... but it doesn't always mean you've got the experienced Master who slowly extends the sub's limits until 'she will do everything'. It can be just as much a journey together, push and pull, and sometimes at one point in that journey the one taking the 'bottom' role is a step further.
One question here would be if you identify yourself as strictly, uncompromisingly submissive, and find it physically getting in the way of arousal, or even find it repellent, if your partner isn't an unwaveringly leading Dominant.
Yes, also there is the risk, in looking for the perfect while starting from the good, to end up with a handful of nothing and a lot of hurt that takes long to heal, a lot longer than whipmarks and shoulder strains.
So really just look at what you've so recently gained...