I'm sorry this is so hard for you.  I am glad you took the time to do your homework & really think it through.

I think we do grow...apart at times & then back together & yes our needs change over time.  Maybe that cannot or will not be the case with your situation...but it was with me.  My husband & I grew apart but have found our way back together.  I guess it depends on what is keeping you together.  For my husband, it was a commitment to his wedding vows.  For me, it was deep love.  At any point in time, either of us could have left...taken the easy way out.  God knows leaving would have been MUCH easier!  But we didn't leave & we are very happy now. 

Maybe it also depends on why you married in the first place.  I guess a strong foundation can take more hits before crumbling than a weak one.  I didn't date my husband because I wanted a boyfriend & I didn't marry him because I wanted a husband...I married him because I loved him & wanted to spend the rest of my life with him!  And luckily, he felt the same way.