Advice pleaseeee

Heyyy, so I just wanted some advice about a situation I am in with my boyfriend. So I’m 21 and he’s 23, we’ve been together since February 2018 so 8 months and everything has been perfect, he treats me like a princess everyday and I actually find it hard to think I got lucky.

However last night while he slept I went snooping on his phone (I know I shouldn’t of done it) and I went through his social media but couldn’t find anything apart from Instagram, there were messages to other girls where he had sent the lovestruck emoji (😍) obviously commenting on a picture or something. And another message of him asking how old a girl is. These messages were from March/April.

I’m not too sure what I’m supposed to do or say😔 any advice?