Considering how the FMC has acted in the past, going far out of her way to help the 3rd wheel resolve the situation with his ex-teammates (a situation that had no impact on the manga other than unecessarily eating up chapters), I wouldn't have been surprised if she had sacrificed her own feelings and offered to help the "ex-girlfriend" get together with the MC. That would have been a far more interesting side-track than wasting those chapters on the baseball jerk.