Here's the way I see it:
Sauron: demons aren't really into marriage; besides, who'd want to marry a guy like Sauron, anyways? He's too power hungry for any woman to stand for long.
Deagol: I'm thinking that he didn't live long enough to get married. Poor guy.
Smeagol/Gollum: Too obsessed over the Ring by the end, but I always saw him as being close in age to Deagol, so he might have been too young to marry, too.
Bilbo: some people just aren't meant for marriage. Bilbo is one. He preffered being by himself at home and, after all that adventuring he did, well, again, who in the Shire (particularly of his class) would wan to marry him? Poor guy. I'd've married him...
Frodo: I think he was just too hurt; he couldn't share that pain with anyone, not even his dearest friend, Sam, so he left tot he only place where he could find healing. Poor guy.
That's just my two cents.
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WWAHD? (What would a Hobbit do?)
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