My ex is in a relationship but I feel he will be back why??

Maybe they will be, but it doesn't necessarily mean it will work out the second time. I had a couple of relationships that I desperately wanted to work, but even though we kept coming back to each other did not make it better. We eventually fell back into the way that things used to be. It is difficult to know when to let go and when to hold out hope. More than anything, you have to look inside yourself to find the answers to these questions, no one can truly give you the right answer. I also bet that when you come to the Q & A's you're looking for the answer that you already have in mind. An answer that will agree with what you are already thinking.