Husband sexting

A few nights ago, while my husband was asleep his phone kept going off, it was from some girl. I unlocked his phone and saw the texts. He started and said things like, where you wanna meet, My dick is so hard, I'm getting lubed up for you. So I woke him and we fought, he swears this is the first time and no pictures have been sent. The next night his phone starts buzzing again. He had changed his password on his phone so I couldn't look.