losing yourself in relationships??

I have been with my SO for 7years, we are married and have a 2yr old daughter together. I am starting to feel as though I am losing myself and can't get myself out of this rutt. Because of this I am losing interest in him as I am starting to dispise him and just lose connection with him. We have tried having romantic dinners together and just relax together but it is not helping. Has anyone else felt like this? Did it get better? How did you fix it?