Here's a success story but I don't see how reading anything will reinforce the belief you're lacking. 
You need to have faith that it all works out in the end. 

https://www.thesecret.tv/stories/got-boyfriend-back/

Laura1234 wrote:

I want believe and I know that all is possible but I have still a few blocks in my mind as that he probably  think he isnt good enough for me, and that he probably have a fear because in the past my parents dont want he was my boyfriend  etc and I dont know change these fears  and this is reason why I have a problem fully 100% believe without doubts..
 

Laura, what might help you is to realize that what he thinks or fears doesn’t matter at all. You don’t have to change him at all. You only have to change yourself. You are the projector and he is just a projection on your screen of reality. If you believe that he is yours now and stay with it, none of that stuff will matter. He will conform to what you believe. He can’t create anything in your reality. Only you can.

Laura1234 wrote:

fizzy wrote:

Laura1234 wrote:

I want believe and I know that all is possible but I have still a few blocks in my mind as that he probably  think he isnt good enough for me, and that he probably have a fear because in the past my parents dont want he was my boyfriend  etc and I dont know change these fears  and this is reason why I have a problem fully 100% believe without doubts..
 

Laura, what might help you is to realize that what he thinks or fears doesn’t matter at all. You don’t have to change him at all. You only have to change yourself. You are the projector and he is just a projection on your screen of reality. If you believe that he is yours now and stay with it, none of that stuff will matter. He will conform to what you believe. He can’t create anything in your reality. Only you can.

 

I know fizzy. I know all theory loa and parallel reality. But t I dont know delete my doubts ..

You delete your doubts by deeply knowing it all to be true. I don’t know of any other way to delete doubts than that. He has zero power to create anything in your reality and you have all the power. What’s left to doubt?

I'd suggest for that situation not doubting yourself by accepting that you do doubt yourself. There's nothing wrong with doubting yourself. Accept it then you can release it. Change it around a bit. Just say to yourself, "I doubt this will happen." And then say to yourself. "Which is exactly why it will happen. To prove that my doubt is unfounded. The universe is going to prove me wrong and ___ will return." Will being the most important. Because it will happen. As long as it's something we want (prefer to happen, not desperate to have happen), the Universe will give it.

Also do as Veronica suggests. Ask what if. What if they call you? What if they come back? What if your doubts aren't worth having? What if your doubts don't stop it from happening? What if they want you more than you want them? What if they are thinking of you right now?