[dk1903]

i don't think married or not should be an issue nowadays.
people divorce ALL the time.
i think the more important question here is, does he have any children?

if he has, then i think your love has been badly placed.
children are innocent. you should not get involved with their father.

if he does not, then i think it's ok for you to compete for him.
it's going to be very easy to snatch him from his wife.
come on, he already has you as a FB, so how much does he love his wife?!
some more, he is much older than you, so the battle is already won before it will be fought.