Advice.......

So I found an unopened condom(just one) in my husbands truck. I confronted him about it and he said he found it and just threw it in his glove box. First of all, whi the fuck keeps a condom that you find. And second, we have been married for 9 years. Why in the fuck would you keep it. Period. What should I do? Do you think he cheating and I just found the condom from a pack that he has not used yet?