What do I do???

my SO and I recently got back together after he had cheated and my parents kind of broke us up due to stress... well tonight I found nudes of his ex on his phone like what the heck?? 😭😭 what do I do?? I don't even know if I can ever trust him again because he probably say he took her completely out of his life but hides it and the worst part of this all.. is I may be pregnant with his kid.