Trust issues

I've been having some serious trust issues with my husband. I haven't done anything to make him not trust me. So there isn't a problem with that. But he's been caught with porn on his iPad and accidentally left a page open on his phone of some naked girl (who was someone's wife...she was wearing a wedding ring). He doesn't know the girl but still. I never had a problem with porn until now. I've always made sure our sex life was insane and active, and I've always given him anything any guy ever wants or could want.  He stopped watching porn and such. But now I'm constantly paranoid that he will take the next step and cheat on me or that today's social media will influence him in a negative way. Trust is so important in a marriage. Are we screwed? Has anyone else gone through this and have any advice for Me?? Help please. this is torturing me!