Husband secretly takes viagara

My 24f husband of 2 years 26m has been secretly taking viagara behind my back. He went out to the store earlier and came home and then took a shower. He was in the bathroom and told me to get his phone out of his pants pocket and hand it to him because he needed to text his mom and when I got it, I guess he forgot to hide it because a pack of viagara came out with his phone. My heart dropped to my stomach and I'm still kinda nervous while I'm typing this because it was 15 minutes ago. Am I not good enough for him? Is he hiding it because he's insecure about It? I mean he's 26 not 56. I'm probably just overreacting but idk how to bring it up to him or if I should :/ I've known him since middle school and we've been together for a long time idk how long he's been hiding it