Connections and sex

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I've been with my boyfriend for a year, I've lived with him for all that time we started out as friends and roomates. 
So all this time we've been having sex and the longer we are together the stronger connection I feel to him during sex. It's not just sex its affection and laughing and basically bonding on a level that I have never felt before in my life. I have never felt closer to anyone on this planet and I've had other serious relationships that lasted for years and I still didn't feel this connected to them, I chalk that up logically because I didn't live with my exes, now sometimes the man can get on my nerves and I want to smack him so we just spend time apart with our own friends but I still love him with every ounce of my being. He is my best friend on the whole planet.