Break Bad Habit

WE HAVE BEEN FRIENDS FOR 12YRS AND BOTH WITH SOMEONE ELSE.THEY ARE OUT OF TOWN WORKING.THEY TREAT us LIKE CRAP AND WE HAVE PUT UP WITH THEM SO CALLED MEN.ME AND MY FRIEND GET ALONG REALLY WELL AND SPEND A LOT ON THE PHONE AND SEE EACH OTHER EVERYDAY GOING SHOPPING ECT..WE CAN TALK ABOUT EVERYTHING I HAVE BEEN IN LOVE WITH HER A WHILE NOW AND I BELIEVE SHE LOVES ME MORE THAN A BESTFRIEND TOO,BECAUSE SHE IS ALWAYS TELLING ME I REMIND HER OF HER HUSBAND THE WAY HE USE TO BE IN THE WAY I TREAT HER.I FEEL THE LOVE WHEN WE LOOK AT EACH OTHER ITS LIKE NOTHING ELSE MATTERS IN THE WORLD.SHE TELLS ME SHE LOVES HER HUSBAND BUT ITS NOT THE SAME WAY OF BEING IN LOVE WITH HIM.SHE SAYS ITS LIKE A HABIT AND A MENTAL THING SHE HAS TOLD ME THAT OVER HIM SHE KNOWS THAT IF SHE GOT REAL SICK I WOULD BE THE ONE BY HER SIDE AND HIM.HE ONLY COMES AROUND FOR BOODY AND THEY HAVE BEEN BACK AND FOURTH FOR THE LAST 5YRS WE ARE SO SO HAPPY WHEN WE ARE TOGETHER AND WE BOTH ADMITTED THAT PART,BUT CAN’T ADMITT OUR TRUE FEELINGS WE ARE MORE HAPPY WITH EACH OTHER THAN OUR OWN MATES.I CAN HONISTLY SAY WE ARE TRUE SOULMATES.ITS BEEN TOO LONG FOR ME AND I WANT TO KISS HER BUT NERVIOUS.I HAVE BEEN HOLDING BACK MY FEELINGS FOR HER BUT DON’T WANNA RUIN FRIENDSHIP.I THINK ABOUT HER EVERY SECOND OF THE DAY,AND JUST HEARING HER VOICE OR SEEING HER MAKES ME WANNA BE NORMAL AND POUR MY HEART OUT TO HER.IT FEELS SO SO RIGHT,BUT YET WRONG.WHAT DO I DO?THANKS FOR TAKING TIME OUT TO READ THIS.ps we both are 38&46 and truly know what love is could this be it for us?

Finish what you started before you add a very bad chapter to your life.
If you really cannot solve your marriage then move on. But, know you have done it for the right reasons.
You and your friend seem to have a really beautiful relationship. Do not advance it until you have resolved the open issues.