In love with a married person

The best you could do is stay away, and just focus on your marriage and your family.

That rings to me as trouble in your married life. I think if you really love your marriage then its time to be as far from the person that told you that.

it's painful and i really get hurt because i love that person, but it's not good because that person is not free anymore..though its painful but you let him/her go..it's immortal in the eyes of the people, specially in the eyes of God..

If I have no feelings for that person, I'd say 'get off me and don't ruin our lives; look for someone who is not yet attached or married'. If I also love that person and don't love my spouse anymore, I will do some steps first to annul or divorce my first marriage so that our relationship will be in proper perspective.

On the assumption you mean the teller would be someone you have no feelings for, I'd tell them I have no interest in leaving them or my partner. I'd try to be friend with them after, but I'd also try to keep a distance.