Depending on age, and maturity, one should never commit exclusively to a relationship if we are not sure of ourselves. That leads to problems.
It's better to not make promises that we are not yet ready to keep, but we should be truthful to our current relationships out of respect so that they can also plan their next move - no matter what they choose, it's their right too.
So, yes, we go through urges, guilt trips, and hope that we can regain that trust.. It's all in honest communication and hope things work out. If not, then it's time to move on and not hurt anyone more than we already have.
I hope this makes sense. If we cannot be respectful and honest now, we won't be later either. These lessons are learned throughout life.