Overthinking is ruining my relationship

Exactly what the title says. How do I stop? I know it’s not so simple. But I am truly sabotaging my relationship right now & I feel like I’m watching a train wreck but can’t stop it.

I have anxiety & trust issues already that I’m trying to work on. But I’m literally overanalyzing every little thing.

Last night my husband texts me to tell me he’s going to call his sisters & then he’ll call me. Considerate of him right? All my mind could come up with is “he’s trying to talk to someone else & cover his ass.” 🤦‍♀️ then he asks to end the phone call earlier so he can catch his tv show & I told him okay but he heard the sadness in my voice so we ended up talking through it & he told me he wasn’t in the mood to watch his show anymore. I feel guilty I was the reason he missed it.

I WANT to work on myself and stop these toxic thoughts. Because he has never given me a reason to doubt him. I just don’t know where to start!