Am I over reacting/ what should I do

Ok so I went to log into my boyfriend snap to save our streak because he is asleep, but he doesn’t care if I get on it because we literally get on each others stuff all the time. I don’t not trust him so I don’t expect to find anything, you know?

So he used to have an old snapchat & he made a new one bc the username was weird so he only uses the new one now but something in my head just told me to look at the other one.. so I did. Keep in mind he has had a new one for a couple months ok.

So when I get on it I see that there are 3 people that say “opened Monday”

So a couple of days ago he was on this old Snapchat talking to three different girls & I had no clue.. I texted one of the girls and said “hey” just to see who she is. I also texted my boyfriend but it’s 3am & he is asleep. I’m shaking I’m so scared..& nervous. I mean I trust him & I never thought he would cheat on me .. but it seems like he luxe’s the other Snapchat for something else .. please help thank you