Mistake..

Fell in love with a married woman who is 12 years more than me.. but now I've left her forcefully .. am I right or wrong ? Help.. Depressed..

I'm 24 now..
My first love broke up with me for her parents.. After a relationship of one year.
Since then I was so alone and depressed that I lost my everything.
One year passed but I was same.

But six months ago I met a woman here in yahoo groups and steadily we became friends.
I shared my depression with her.. 

Soon I found that I was in love with her. 

She is 35.. Is a doctor.. Has a healthy married life. She has a rich hubby and a daughter.
Her standard is high than me. 

When I confessed my love to her she said that she is in same too. 

We shared many feelings..
But one day when I asked her if she would marry me.. She declined saying that she loves her hubby very much. 

I was too hurt..
If she loves him so much then why she played with my feelings and used to say me that she loves me badly..?
Why she made me to fall for her ?

Yesterday I made a final decision of leaving her.
Yes she might had got hurt deeply.. Also I'm feeling too guilty.
I blocked her from everywhere. 

Friends.. I did this cause I don't want to disturb her marital life. 

But.. Now once again I'm left alone and depressed.
My eyes are left with floods of tears.

Please say me if I am wrong or right ?
And now how to get rid of this depression ?
And what is the punishment for this mistake ?