Need advice about boyfriend lying to me

Ir

Hey so I need some advice. So yesterday my boyfriend was showing me a YouTube video on his phone. Well when the video was over he double clicked to close the window and the screen behind the YouTube screen was another page open of a full screen of a half naked girl. He quickly exited out thinking I didn't see. Which I did. I asked him about it and he straight up acted stupid saying he doesn't know what it is and how it got on his phone. I know it was porn. Which pisses me off that he has been lying about not watching porn. Which I know he is watching porn cause he hardly wants sex with me hardly every touches or kisses me. Gets mad when I even rub his arm or back. I told him all this and his excuse is he's been too tired and too busy dealing with work and with his daughter. He apologized but I'm losing my trust in him. I also know that he doesn't find me sexually attractive anymore since my baby bump has started showing. Cause when I asked him if doesn’t find me sexually attractive since I got pregnant. He didn’t say anything for a good minute or two.