Re: I think I don't know if I want to be married anymore.
This sounds like something straight out of my life!
This is adivice, and life experience that I am about to give, nobody but you can know if you love or dont love someone.. and that my dear will tell in time.
I have been through the same situation as yourself, in my much younger years. It has been hell, for the children and myself, while my husband seemed to coast it with no problem. It is only now I prepare myself to leave, A, because my children have left home, and B, because I work fulltime and can afford to leave!
Yes, you can become mentally drained, in a unhappy relationship on a daily basis you are fighting a "Fight or flight" feeling which over time will leave emotional scars (mine was 20 years worth)
Its anger, hurt, resentment, and a whole loada other stuff chucked in, it builds up. And yes I have been through the feeling of not loving my husband too, I started to feel that way about 15 years ago, and it still has not left me... Yes I am fond of him, and laugh with him, but he killed a part of me that will never come back. Its all very psychological, I think heaps of couselling could help, but do it now, not after 20 years..
Good luck x