Throwaway: Similar situation, married to a woman who is more my best friend, but not anyone I would consider my 'true love.' Several times we tried breaking it off, but I'm weak, I have attachment issues. (More than that I get addicted so to speak, or I'm so afraid of being alone, even though I was beyond happy single)

Fast forward five years and almost a year into marriage and while my situation is not as bad as yours, I have this aching feeling that I'm settling. I have no passion for this person, I don't have that "man I'm so lucky to be with this woman," feeling. I'm borderline indifferent to her physically. We do sexual stuff, but it's more just because I want to get off more than anything. The worst part is I just see the months going by, and while I'm still young (30 this year) I know as I get older that feeling that my 'true' someone is out there; someone who I'm excited to wake up next to and proud to show off is fleeting and will get worse with age.

But again, she's my best friend, intellectually we share the same interests and are made for each other in that regard; But there is no passion, no romance, no desire; anytime I see couples that are just 'so in love' I feel a loss, like I'll never have that feeling. We were married in a hurry and I never got excited, there was never a second where I was anything more than 'meh' as my fiance stood there while vows were given.

Maybe I'm thinking the grass is greener, but I've never had that passion with her, that excitement seeing her naked. (barring the first couple months of dating, but that's with anyone) I have moments where I think of divorce and know she has similar thoughts, but then I fear what I would do without her.