Breakups can of course involve frustration and bitterness, and sometimes the ex-partners will carry guilt regarding their inability to make their partner(s) happy, but any partnership needs to take an honest look at the partners’ needs and recognize if they are ill-equipped to meet them. The decision to go your separate ways for each of your own good can be a self-affirming and healthy experience and shouldn’t necessarily be seen as a failure or “proof” that these types of relationships never work.
