Being lied to

My boyfriend said he's gonna meet a guy friend of his but instead he met with a girl who had a crush on him.

He never told me that he met her but when i was going through his phone i saw some deleted selfies of them and some photos of that girl he met that day. Then when i asked about him did you hang out with a girl in the previous days and he said "no" directly and when i asked can you swear it, he said that he swears. What should I do now? Now im wondering what else he lied about and it’s driving me crazy 😞😞