Cheating Husband on Tinder

So I’m an 18 year old who met a 22 year old on Tinder. We only talked for two days and then I found out he’s married. I feel disgusted and ashamed (even though I wasn’t aware) and I broke off contact and told him to lose my number. A friend of mine said I owe it to his wife to tell her about his actively searching out an affair and another said to leave it be. I personally was going to leave it be because the dude is in the military and is currently in California, the wife is in Michigan, and I’m here in Georgia. Since it was only a two day thing I don’t think it’s a big deal but the girl in me wants to tell her, but I don’t think it’s my place. What do y’all think?