I think you know that this
Ex is never going to work deep down inside, but I also get the feeling from what your saying that your current bf may also be the wrong guy for you. Hey you have to kiss loads of toads sometime's until you find your prince.
You and your current bf need to have a good talk and do some soul searching. It's wrong for you to think about getting back with your Ex whilst you still have a bf, think of the hurt that could make for both of you !
Hey come on Ex's are Ex's for good reason's.