Getting over heartbreak is not a journey. It's a fight, and your reason is your strongest weapon. There is no breakup explanation that's going to feel satisfying. No rationale can take away the pain you feel. So don't search for one, don't wait for one, just accept the one you were offered or make up one yourself and then put the question to rest, because you need that closure to resist the addiction. And you need something else as well: you have to be willing to let go, to accept that it's over.
Otherwise, your mind will feed on your hope and set you back. Hope can be incredibly destructive when your heart is broken.
Getting over heartbreak is hard, but if you refuse to be misled by your mind and you take steps to heal, you can significantly minimize your suffering. And it won't just be you who benefit from that. You'll be more present with your friends and more engaged with your family.