Isabella's misfortune all stemmed from Blanche. Since she couldn't be with Felix now, it didn't matter to say such things.
Felix only felt pity for Isabella; no one expected things to turn out this way.
"If you still care about our relationship, then publicly announce that you and Blanche have nothing to do with each other. You will handle this matter fairly and justly. As long as you and Allen are not involved, Blanche will have no support. Let's see how she handles that."
Previously, when Blanche was in a desperate situation, both Allen and Felix wanted to help her. Now that both had stepped back, would anyone still help Blanche?
Felix felt helpless and could only do this. Compared to Blanche, Isabella's pain would last a lifetime. If he didn't help her resolve it, Isabella would likely be ruined for life.