My Boyfriend uses dating sites and he...?

You will get the chance of having your own babies, and tricking someone into making you pregnant when they think you're taking the pill is not the way to go. If he's playing around why on earth would you want his child this is not the solution to your problem. You need to wave him "goodbye", have confidence in yourself, being shy is not a "disability", and meet someone who deserves you, not this jerk.