What if I've been repeatedly lied to?

I stupidly told my fiancee private personal information because he swore to me and to god that he would never repeat it to my mothers husband. being that hes a devout muslim I figured if he would swear before god that I could trust him. last night I found out he told everything I said to my moms husband, but he twisted around what I said and further fabricated things that were untrue. now my mothers marriage is over because he feels he cant trust her at all and he refuses to even speak with her. I dont know how I can fix things between them and I hate to see my mother in so much pain. Now Im extremely unsure if I should continue to pursue a relationship with my fiancee as I know he cant be trusted. if you have any thoughts on this situation please enlighten me. I need every bit of help I can get.

it depends one what the secret was. if the secret was that your mom did something bad and your stepfather really should have known about it then he did the right thing.

aha, thats the thing. what I told him wasnt all that incriminating, but what he told my moms husband in response to what I said was. her husband thinks shes having an affair because I told my guy that my mom was nice to the man renting a room in our house because she needed the money and she feared if she upset him he would move out and we would be in a very bad situation financially. what he apparently told my moms husband was that mom was nice to the tenant because she was in love with him and that she was only using her husband.

Dear ana_luna,
Sorry, but I find it hard to believe you would even consider still seeing your boyfriend? He betrayed you and he lied. What more does he have to do before you see that he isn't the right one for you??? Do you think he did all this to strengthen your relationship??? He was finding a way to tell you that you deserve better than him...and he's right.
Sue...good luck