Whether a boy will reconcile with his ex largely depends on the reasons for their breakup, their emotional state after the breakup, and whether both parties are willing to rebuild the relationship.
If the reason for the breakup is reconcilable and both parties are willing to solve the problem and improve the relationship, then the boy may reconcile with his ex partner.
However, if the breakup involves issues of principle, the harm is too deep, or both parties have moved forward separately, the likelihood of a man choosing to reconcile with his ex will be greatly reduced.