+Christ is risen
Q: I feel really ashamed about a sin that I did, and I don’t want to ruin my relationship with my current father of confession. Can I go to a priest somewhere else and confess it?
A: It’s alright to confess to someone else, the sacrament itself requires only that you are repentant and then that you say it before a priest, so you do not need to worry about whether or not you are “permitted” to say it to another priest.
The real issue is why you would be afraid of “ruining” the relationship with your current FOC. Your FOC is supposed to be a guide, so knowing everything about you helps him guide you as a whole. If you fell, no big deal, we all do, but it’s important for him to see what kind of things are leading you to those falls to work on it together so that you grow. It’s not because of rules, it’s supposed to be because you want to grow.
If someone wants to lose weight for example, and starts going to the gym, and you have a trainer helping you, he’s going to want to know what’s going on with you. If you’re hardcore working out but losing no weight, because you are secretly snacking on crazy amounts of sugar, well… how can he train you if that’s not disclosed? So try and take that spirit, but definitely don’t worry about confessing to another priest.