Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
As you undoubtedly know you are keeping an illicit relationship with the boy and you are determined to continue that. And the boy wants to force you to divulge your sinful transgressions of the past. Both of you are adding sins after sins and yet want to use the law of Allah to justify your actions.
I would advise you to cut off relations with the boy and turn to Allah in sincere repentance for all of your past sins; once you do so, Allah will bring peace into your heart. Otherwise, you will continue to torment yourself further and further until you destroy your life.
There is no salvation in such a relationship. If you seek peace in such a lifestyle, it is like someone going after a mirage in search of water.
I would urge you to refer to the answer linked below on how you can turn to Allah in repentance:
The Door of Repentance Is Wide Open
http://aboutislam.net/shariah/refine-your-heart/advice/door-repentance-wide-open/
Almighty Allah knows best.
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