Wednesday3

I need some advice,

I've been dating my boyfriend for over a year now. He is a recovering opiate user and has been for a year and a half, he was clean when we started dating. For the last month I've had a suspicion that he's been using again. I jumped on his computer while he was asleep, innocently intending to check my email. When the computer wasn't working I restarted the computer and it told me he had recently updated pictures into a file he keeps for pictures he's had for drugs he's done in the past. I looked in the file and there are new pictures in there dated for last month!! I want to confront him about it but I don't want him to know I snooped in his computer. I feel like even if I do tell him he will make up a lie explaining it and accuse me of not trusting him and nothing productive will come of it. What should I do?