Husband and social media

my SO was secretly using Snapchat behind my back I stumbled across it when looking for google maps when I logged in he had a few friends which include some girls checked the direct messages and he had conversations with two different girls of course the text is gone and shows the date and person whom he was messaging according to him they only commented on his post.... idk what to believe and we've been together for 10 years and have 2 children and TTC #3 he's cheated in the past about 8 years ago when we were just beginning to date.