You might like this one:
It's has nothing to do with marriage, but tells of a person looking back at a childhood friendship that fell apart due to unrequited love. It's such a beautiful song!
perhaps jean shephard's "don't fall in love with a married man".
what'd done is done. the best cure would be to fall in love with another man. preferably a single man. there's many out there. you just have to search for them. you can't sit there waiting for something to happen, let your love life pass you by, because there's nothing worse than unreciprocated love. perhaps you can start though with what had you falling in love with him in the first place.
Married Men by Bonnie Tyler
Stay - Sugarland
Hands Clean - Alanis Morrisette
Head Over Feet - Alanis Morrisette
Lips of an Angel - Hinder