He smashed my phone

Me and my boyfriend have been off & on for 3 years. We both seen other people and now were back at it. Last week some time when he was at work he texted a girl he was seeing when we broke up. She texted his phone so I called her from mine while he wasn't in the room and she told me that he had been talking to her... So when he came in the room I asked him when's the last time he spoke to her he told me before we got back together and I told him he was a damn lie that I got her on my phone. He took my phone and smashed that bitch not once but twice then threw it out the window. Were still together and I trust him even though he bold face lied to me. This is more of a vent then a asking for help type post.