Your temper is always well-regulated. Neither of you will ever put the other down or use them as a punching bag.
No matter your state of mind or level of intoxication, you maintain a polite demeanor, and people reciprocate.
Instead of being nasty to one other, utilize your fights as a learning opportunity.
Because of your dedication to teamwork, their difficulties become your problems and vice versa.
In good times and bad, you will always be there for each other.
Having said that, you're also fine with each other taking turns being alone.
Although your significant other is likely the reason you smile most of the time, they certainly aren't the only one.