Well that all depends on whether are you going to bear all the
consequences or not. Firstly the person is married...would you want
to be termed the third party and to be blamed for breaking up a
family and marriage?
Well i always believe, never trouble trouble, unless trouble
troubles you. If you are willingly to bear every consequences then
by all means go ahead. But do remember...you will always be the
losing end, cause whatever the person promise you, he/she might not
be able to keep it simply because he/she is married with a family.
Even not because of love, he/she will still think of the kids. So
my advice, rather then to hurt yourself further in the future, why
don't you step out of it now and find someone who is single and
available and able to put all the attention, love, care and concern
on you?