This is about someone who wants to prove itself to the world that it can be someone who can stay in a relationship and be wanted also needed at the same time. It wants to prove everyone who has ever abandoned it wrong. It tries to build a relationship with another person in order to do that. Its partner concludes the part of its Self as its missing piece.
This is about someone who wants to be prioritized, is sometimes obsessed with another person and loves being in control of its partner to the extent of mistrust. It gains all that by being in a relationship with its current partner. It proves its self-worth by the evidence of its sustaining relationship. Its partner concludes the part of its Self as its missing piece.
Realistically speaking, we are together now with resolved issues.