I think we may need a little more information before we can help.
Why did you break up? Be honest. Don't gloss over any problems you may have had.
Regardless, sneaking out the house won't get you anywhere. If your parents catch you, you have broken their trust in you. Trust is something that has to be earned over time. You break your parents' trust and don't think for a second that you'll be allowed to go anywhere for a good, long time. How would you explain it if something terrible happened to you whilst you were "on the loose"? What if you got hurt? What if someone discovered you and happened to mention it to your parents? It happens all the time and you'll be sorry that you decided to win the battle. You wil have lost the war.
If you were a parent and your child sneaked out on you, how would you feel?
Yes, I am old enough to be your parents' age, probably older, but it doesn't mean that I'll automatically side with them. I'd like to hear your side of the story first; don't be surprised if other posters ask additional questions if we don't quite what you're trying to tell us. We want to help you if we can, but you have to help us.