Many times i have talk to my husband about this?

it is not the first time nor the second time it is many times it is now overbearing i am in a marriage for the past six years and i dont want to see that go down the drain like that i have a 3 yrs old daughter who he adore very much but i can put my life on hold because of her he dont ask me out he is not romantice at first our relationship was sparking hot after he fing out he was a diabetic everything just fall love making everything sometimes i asked him what he is studing he he say nothing what can i do abd there is this another person who is for me more than my husband and than when i am with him my husband is on my mind because i know he dont deserve this this is my only big promblem he take of me and his family very well and to me he is still leaving room for this to happen and i am feeling so guilty what to do?