i cheated him 4 years ago but never being caught but now i caught him cheated on me too!!

i am 32 with kids. 4 years ago my husband and i live separately for a job reason but still met once a month, sometimes twice. in that time i had another man who always pay attention to me and we ended up having sex 6 times until i decided to stop that infidelity. Of course my husband doesn't know it until now. Recently i become one of church leader in my community, i repented to God, i confessed to Him all my sin. And i tried so hard to live a good life in front of Him. I give all my best to become a good wife and mom. I never do something that against my husband will, and our marriage had nothing problem at all until last Sunday... My brother in law woke me up when my husband went to work. He told me that my another brother in law's wife is complaining that she and my husband having sex inside my very own car!!!I cried my eyes out, only God knows how terrible my feeling when i heard that. The woman told me bravely that they only made it only once and it never happened again after my husband apologized..
for ur information, that woman went in a same workplace with my husband because i pleaded to him to recommend her to his boss. And i was the one who forced him to give a ride to work even though my husband against it at first..it's because i trusted them with all my heart.Now when i know the truth, i feel disgusted imagining my husband having sex with her. But how about my terrible history 4 years ago that he not even know?I feel like i want a divorce but when i think that even God forgives my sin, how can i judge him with what he done to me?the difference between us is i never got caught, having sex six times in a full course lovemaking with someone he don't know. for him, i caught him doing it once with someone i thought as my own sister, and they doing it on the front seat of my car.it's been 2 days since we've seen each other. Now i m with my two kids staying at hotel far from home just to see if he ever called for forgiveness. How come i asked him to apologize when i never apologize to him about my cheating 4 years ago?i have this 2 sides of me now. One telling me that he is a jerk, cheating to a very good wife who repented in front of God and become a church leader. The other side telling me that all this happen like a karma..i got what i gave. now what should i do?