looking through my phone..?

so my boyfriend and I have almost been dating for a year. we have always been open about our phones and what not so it’s not a big deal if he even wants to use it. I fell asleep rather early last night and he ended up waking me up at around midnight for sex and after that he brought up messages from 2016 with this other guy. he said he found them and that it was just a bunch of nudes and sexting when I honestly forgot about all of that. he said my body count must be higher and that I’m lying about it. I know I shouldn’t of still had it but it was deep down the list of Snapchat convos that I forgot even happened. I do feel bad about him having to see that bc i would be upset too but he just took it to the next level by calling me a liar and accusing me of things that I honestly did not do. He thinks I’m wrong for being upset about this and crying so now I’m just not sure if I even should be able to be upset about it?