Being a heartbreaker, in my opinion, is not something to aspire to, but it's more about understanding it's okay to prioritize your needs and move on when things just aren't working. It does entail hurting someone's feelings, but you should always strive to do so with kindness and empathy.
And remember, it's important to communicate clearly about your feelings, be definitive in your decision and not give false hopes. Always be respectful and considerate if you decide to end things.