What sounds more likely: Did I catch him or am I tripping ?

I’ve been talking to this guy for a little while and everything’s been okay but I feel like I definitely caught him slipping earlier, but he says “I’m tripping for no reason”. So here is what happened:

On Snapchat, he posted a picture of himself with the caption of “god you’re so pretty”. I texted him and told him he posted something by accident. (Now, i don’t care if he talks to other girls, but he’s been swearing up and down that he doesn’t.) And told him that I felt that made it obvious he was talking to other people still. He says he swears that’s not what it was and meant to cal HIMSELF pretty 🤦🏼‍♀️

But I don’t believe it because it definitely seemed like it was an accidental post he meant to send to another female. 1 It was a random pic, like he just took one real quick and 2, that sounds like how he talks when he compliments.

But he still SWEARS he’s not even thinking of another girl 🙄