Nak, first thing, please reach out to someone you trust, or consider talking to a counselor, especially while you're pregnant. Ang stress at anxiety mo ngayon ay importante for you and baby, hindi ito klokohan.
Honestly, reading this, hindi ka ang toxic one dito. A partner na nag-lie repeatedly, keeping in touch with exes without being honest, then turning it around on you when you bring it up, that's not trust issues on your end, nak, that's red flags from him. Trust issues develop because someone broke your trust, hindi ang iba pang paraan.
A few of my mum friends have been in similar situations, at ang sabi nila, when you're carrying a baby and already raising twins, you deserve someone who makes you feel secure, not someone who makes you hunt through messages at doubt yourself. The fact na kailangan mo pang stare him down para mag-admit ng truth? That shouldn't be your job, love.
You're not toxic for having boundaries. You're protecting yourself, and that baby. Please talk to someone, whether it's a trusted friend, family, or a professional. Your mental health matters just as much as the pregnancy.