Make another account and block + delete the opposite gender people from your earlier account.
If you block and delete and keep the ad, you still got the urge to unblock and chat. But if you got a new account with all the people you need in your new one - then you don't keep checking to see what the person you blocked is upto (like if they online or not.)
What dangerous said is is clever too, cuz that way even if you want to talk to the people again, you can't because you don't know your pass or secret answer. So you gota stick to your new one.