While your anger is justified, the best path forward is to focus on Lily’s happiness on her wedding day.
Send him the bill for unpaid child support
You don’t have to make peace with him to support her. You can tell Lily that you support her decision to have him walk her down the aisle, even if it hurts you. You can have a separate conversation with her about setting boundaries with her dad, making it clear that his appearance at the wedding doesn’t mean he gets to be a part of your life again.
Remember, you don’t have to forgive him to find a way to move on.
This is about prioritizing Lily’s happiness on her special day and choosing what’s best for your own emotional health.
