Stuck in my head

Monday night, my bf of 4 years received a call from a woman at 1030 at night. I woke him to call her back & place it on speaker as I never heard of the name on the phone before, he immediately got defensive and said he wasn’t calling her back because I woke him for stupid stuff, my anxiety would not let me let it go, so I asked again if he could just so I could put my mind at ease & he refused, he got up out of bed called for a ride away from our house, packed his work clothes and left. I asked him in the midst of him getting ready to leave why not just call since you’re already up & making phone calls! It didn’t & still doesn’t make sense to me that he’d rather leave than to clear up any of my confusion. I haven’t been able to think clearly this is weighing so heavy on my heart. It doesn’t make it any better that I’m pregnant going through this! I don’t even know what to say to him