Ay sis, I feel you talaga, that's such a painful thing to go through, and it's totally valid na uncomfortable ka sa idea na ma-invite siya sa binyag ng baby ninyo. Honestly, a few of us moms have been through trust issues with our partners, and what helped ay direct conversation with the boyfriend mismo, not the family, but him, about kung bakit siya okay with that, kung alam ba niya kung paano ka makakaramdam, and setting boundaries together as a couple before facing the family. The binyag should be about celebrating your baby and your little family, hindi tungkol sa past drama, kaya maybe frame it na ganyan sa boyfriend, na this day is sacred for you three, and you need him to have your back. Communication is key dito, love, but if you two still can't agree or if this keeps bothering you, couples counseling might really help, lalo na may bata na kayo. Wishing you peace with this!