Knowingly taken false oath in the name of Allah...after 10 months of marriage i started finding guilty and wanted to tell my past to my husband

I'm a 22 year old married woman, I love my husband very much. I had a realtion with one boy earlier which lasted only for a month, in that time he had approached me sexually, but still i was a virgin, it repeated 5 times. then I overcomed that and i ended up that relation, after sometime i got a proposal and got married, i was happily living with my husband, but after 10 months of marriage i started finding guilty and wanted to tell my past to my husband, i started but it ended up in a lie, now i know that if i say the truth , i'll loose my husband. I had to take a false oath on Allah too. I did Tawbah, but what all should i do for rependence, Now i'm in a way to become a true muslim, and i don't want any sin to come to my husband as he is thinking that i gave him a true promise in the name of allah. I don't want to disclose this truth as it'll ruin my family, I'm helpless, i want my husband. Please advise, May Allah bless all Thank You