Husband on Dating Site

Today I decovered that my husband has a profile on a dating site through his email it's called TAGGED 
How should I handle it?
How should I approach him about it without speaking off emotions? 
We got married in June 2014 & he started the account in July 2015 has been checking them every since .... I hacked into his account on there everything is deleted and even the history in his phone too!! Besides the recent stuff he been on....