Hope you broke up in person rather than a text or email. Secondly its best if you end a relationship that you cannot commit to 100% because its unfair for you and the other person being a woman I can tell you its all about how you deliver.

If you told her honestly how you felt (I am not saying it wont hurt her it very much will) and ended it with dignity then ya that is the right thing to do. For now no matter how hard it is pls keep communications to minimal. She and you both are vulnerable do not slip and let her back into your life until you both agree to be friends (many people think they can be friends but I dont think its possible if the other person truly loves you).