Advice please!

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My husband (of 5 months, been together 5 years) and I were messing around on each other's phones and fake "snooping" on each other and I found in his advanced web files that he had data on xMatch.com and OneNightFriend.com, which I asked him about. He said he didn't know what it was, or remembered ever going on there. I used the forgot password option for OneNightFriend on his usual email and sure enough, a retrieve account email came through.

It showed that he had set his account to an age he's been for less than a year, and had a location set for somewhere he visited this past winter with his family.

He says he doesn't remember anything and that it wasn't recent

He also said before I revealed that I knew he had an account that he only went on the sites to "explore" that part of the internet. There are no matches or messages or anything on the account.

Am I overreacting or am I right to be .3 sec away from kicking him out?