welcome, embarassed.
You clearly still have your integrity. You are also clearly in a toxic relationship. You can't blame him for your actions, but if nothing else, he is a bad influence on you (remember bad associations spoil useful habits!)
Being embarrassed for being dishonest and correcting it is an honest thing to do. Its a choice and you made it. No one is perfect, but you aren't wallowing in evildoing!
I'd rethink the boyfriend and think about the kind of person you want to be-you hang out with those who you can respect and admire. Honest people don't live in any particular church-and we know there is dishonesty everywhere. Id suggest finding people who make you grow better. All good things to you!!