My boyfriend still keeps on using dating websites and tries to hide it from me, how do I deal with this?

You tell him he has one last chance. If you ever find evidence he's using them you're over. And you've got to mean it.
He shows you no respect like that he doesn't deserve you.
Start another one of your own and let him find it... better yet post on Adult friend finder and say your a couple looking for another male and let him find that one 😃
The easiest way is to give him a legitimate reason to use those sites. Place “ex” in front of boyfriend.
You don’t need this aggravation in your life. Better does exist.
If he has a girlfriend he should not need a dating site I will tell him if he doesn't stop you will leave him for somebody like me someone better and more mature
Opinion
5Opinion
Do the same back? He will hate it, then explain that was how u felt when he did it.
He deserves to be dumped. So just be honest about snooping, than dump him.
Do the same or leave him
Tell him one of your friends seen his profile
Duh... end it
Superb Opinion