Pray for me...please

I found out on Saturday night, I listened to his voicemail and there 'she' was. Whispering that she loved him. My husband. I was a selfish, foolish woman 7 years ago, and I had an affair with him, he left his wife and married me. Of course that only led to an unbelievable amount of devastation, anger, hostility between his wife and children, and me 'coming in the back door', hello I'm your new step-mom. It took years for his children to trust me, to be able to say out loud how I hurt them, and eventually they say they came to love me. But now. Now I am getting what I deserve, I know. My pain is in so many different directions. I cried for hours and hours this weekend. I cried for all of us. For the family that eventually came together that is now shattered. For the realization of the pain I caused to his 1st wife, I know that pain now, and I am filled with shame and remorse. Why? Why? Why did I start down this road so many years ago? I had never done such a thing before, and all during the affair I fought my conscience. But I was selfish, I wanted to feel good and damn the consequences. And now my sin has come back to me, and I'm lost. Please Lord give me stength to face this day, and all the days to come. I cant do this alone. Please guide me.