Is my husband cheating on me?

here is the deal. i always try to do everything in my power to keep him happy and satisfied sexually im 7 months pregnant and since the beginning of our marriage he's always lied to me about seeing porn and about certain female friends not really being his relatives and then later i catch him telling me something else that they really are not related. he supposeably goes to work with his brother but when i go looking for him hes not there he's always somewhere else and his brother covers for him. I have caught him lots of times looking at porn and jacking off to it. tonight he went overboard when i asked him why he started to get mad and trying to tare my clothes off and wanting to get pulling me from my legs and arms and i asked him if he had been also cheating on me and he starts to raise his voice louder and screaming at me saying its all my fault that he's tired of me and that he is gonna take me back to my parents so he can get rid of me. and i went with him to go back but instead he took me to the middle of nowhere and threatened to kill me and himself if i left. and i asked him once again why? and he said it was all my fault that i make him want to do those things and he was lying to me saying that it was his friend the one seeing porn on his phone not him and then he admitted that it was him but because of my fault. he never really answered my question truthfully if he was cheating on me. everytime i ask him if he would he always gets defensive. i don't know if i can trust him anymore nor do i know if i even want to keep making him happy in every sense. im really confused and need some help plz. thanks