The party was a tremendous success. We both had a lot of fun.
Clearly, each of us is capable of functioning (quite well) as individuals.
We have successfully proven that we don't really NEED each other.
We can do things separately, and we won't self-destruct or fall apart.
This relationship has survived multiple tests over a short period of time.
I should be thrilled that everything turned out so well.
Q: "So why am I feeling this way - - what more could I possibly want"?
A: "I'm still wanting a friend and partner to do things with."