Although there are many different variations that you could use, I would the express the idea that you conveyed through one of the following sentences:
In a "past" sense:
"I will never be as comfortable and happy with others as I was with you."
In a "present" sense:
"I will never be as comfortable and happy with others as I am with you."
If you want to emphasize the feelings of comfort and happiness you might want to consider using the word "nor":
"I will never be as comfortable, nor as happy, with others as I am with you."
I am American, and I have seen a similar constructions widely used in both speech and writing. The answers I gave are more descriptive, rather than prescriptive, in nature.